Malicious PDF — malware analysis report

Static analysis result for SHA-256 a088440aef044eab…

MALICIOUS

PDF

87.1 KB Created: 2021-07-05 03:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 486ba2867688d3f65e5a05c5be5a436a SHA-1: 179e667237c98b74b909feb05b0722d8cdf6c59f SHA-256: a088440aef044eab797fb388bac3ead73c6c20f6795205c88d15ba0eb7bc6fca
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a phishing or malware distribution attempt. The presence of a 'callback lure' heuristic indicates the document may prompt users to call a number for support or to resolve an issue, a common tactic in tech-support scams. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://garglob.ru/uplcv?utm_term=spot+spay+and+neuter PDF link annotation
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16082db8abf759---43681024960.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/nopiripobegiputinu.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/lenijanoxeduwadoji.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/nufitikivibaradapebirul.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/koroxuros.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075839134607---544024112.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/44cbfe2a1b98c4a0ca53d18b7064e991/maxedoretepelobimopane.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c663bfc55fe---26127633840.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/f9b9179ac3c80873c42c38246364ba3f/besijuzupujofi.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/0b323bjqpughcaa2cb545vhude/jegefikagejuba.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ad07570ff---43045779869.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/89968175229.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adafbd91ffb---xajamidurafan.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87fbd5c18---32682289539.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/25445357f2eb9f658ed2d19613ad6a3e/17754386208.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/vetokowiwamubidifibaw.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bf89ddf1e---kaxivekesowokovizupokoj.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd0f01d141---73928502368.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/1623294098100.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8c038e776---fudexajamajedosopozalodiz.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8e6dd0d77---wutun.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/96655538412.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/kasapapubafupik.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/tonedosexesolisajakibilob.pdfIn PDF document text
    • http://pasted-radio.de/web/files/96945246761.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/78757077031.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/xululizunu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10845 17656 bytes
SHA-256: de5a5338f1170bf0ac0583434afe88aade50183b9ed84825488fd2cefdf8b5a9
font_02_sfnt_off000136e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E7 10536 bytes
SHA-256: d9a6656581f01dce8ac3cac5e15de2f465469e3bdd226dca9178db813aafaa24

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