Malicious PDF — malware analysis report

Static analysis result for SHA-256 e766f68d88722d14…

MALICIOUS

PDF

74.8 KB Created: 2021-09-06 07:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b132446c1b3ec31aa50e30c49a88c65b SHA-1: 569e854a45708f0a744198643b2b3a64e3714e76 SHA-256: e766f68d88722d14230b3ba4a0e559e0f0eb8d6ce1669587464ee252735b1942
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external sites, many hosted on compromised CMS platforms, suggesting it is part of a phishing or scam campaign. The presence of download buttons and callback lures further supports the attack pattern of tricking users into downloading a payload or engaging with a scammer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=can+google+drive+convert+pdf+to+word PDF link annotation
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c05583ccdaf---wagufadi.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/97c65db20ecf52648e724e2ba9b150f2/2485698170.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/rujagedaxegatimav.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975c9885685---5728595050.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a65652dcd56---29845292132.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/burewuxedibixin.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/29907564106.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160843a3a24070---miboganemegoku.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/665982064.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/rarukuxaxedobotubaj.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/68904711370.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/25570591308.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/5dcadb88501ed4ddea121b3027dffc34/posasedepar.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/10267650310.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/tukinatutijivip.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/26f74ab48a2970f052cdb264adf3a16e/jizodet.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/wovufenumuf.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/72480820115.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/60b96a27b05bd17d0dd56fb31e90ab25/55584094289.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c58d5864cc7---jiwisibixaroxesodexak.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/68087259676.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_off0000bfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE3 17500 bytes
SHA-256: ea67d3a38a26b6913b9b6125a425acbf2b6c9622bb2c91e24f50adbe60b83247
font_01_sfnt_off0000eca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 10812 bytes
SHA-256: 39585708302b10832977961b773d49e007cc4f0b3f7391a4477ef1fcbe355b82
font_02_sfnt_off00010598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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