Malicious PDF — malware analysis report

Static analysis result for SHA-256 09be08891e4b224b…

MALICIOUS

PDF

86.0 KB Created: 2021-07-13 15:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3e5ebad7f6f2b4456a89872882a38d7b SHA-1: 795bfa7fa13eb3928f2ccba90b02818990716d61 SHA-256: 09be08891e4b224b4d2c3fc4a738cc0fed28c497d745b4cfb233c5e98dd49f67
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to disposable hosting and compromised CMS upload storage, indicating a link farm designed to host malicious content. The 'SE_CALLBACK_LURE' heuristic suggests the document's content is intended to trick users into calling a phone number, consistent with phishing or tech-support scams. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 http://maryalo.com/userData/board/file/kelawazamug.pdf In PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/8f70a4c96286ca1a1b5684c68ab30125/3042327639.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/47439185075.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/k7rd9d866a6q1rcdkd18mc5ua8/kajumenetubodogawis.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/60656733168.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/2c44vujbcn9kvhtvd2qfln0ea3/xagusivuwatugofubukijumux.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/45298755352.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210601_052428.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36b77c003---30727186919.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c551c088426---funozobuwasosafovivus.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/kadotavivibodoke.pdfIn PDF document text
    • http://wenxuezj.com/images/File/40595703762.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/86812753787.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/lusovulubapexekeloluduma.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2bc00f937---81145124128.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077f9f7472ec---viworidoparogolofizupux.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160904c0f8e8e9---bekefigogenabusekeposu.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430031322729263.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/43555916958.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082443e343df---16707602196.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608052c8dae48---40933995576.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/68202055635.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/tizenupuwabuwet.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607492dc8afc2---fisevekitet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=driving+while+suspended+for+duiPDF link annotation
    • 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_off0000ed43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED43 16624 bytes
SHA-256: fe936f99ffd5fc01105869b43687f9f4249de4b5140e0cc27fdf3295c4e30225
font_01_sfnt_off0001187e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187E 10772 bytes
SHA-256: 5caa6475dfe53b7c81367522cb74784fceb5472610ab85b11aea3e7b26968c2c
font_02_sfnt_off00013103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13103 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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