Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eaf01ee8aa63b5f…

MALICIOUS

PDF

88.9 KB Created: 2021-09-05 20:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af7668c32689f4197eef04975e26310b SHA-1: add98df2dc38a79b34e778fc0f2cd4ce6f47c8c2 SHA-256: 7eaf01ee8aa63b5f9d0e2cfacba4a64cbca58f6eab695467823f1834aa5cb98d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, likely to obscure the true destination. The 'SE_CALLBACK_LURE' heuristic suggests the document's content is designed to trick the user into calling a malicious phone number, a common tactic in tech-support scams and callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 https://cructi.ru/uplcv?utm_term=automatic+auto+transformer+starter+pdf PDF link annotation
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160886a77083f7---lewuve.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/mejerebapatesos.pdfIn PDF document text
    • http://s-box.biz/upload/datoteke/90671889667.pdfIn PDF document text
    • http://msiutilities.biz/documents/tesimuwa.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f44b76954---vojasupivazikupe.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/7074331108.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104508c98cd3---77980803062.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/6c2460df7116f67c1be13861da198486/56228918827.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/8571cb738d10dd882edd3395b60c9e49/38169987584.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/pivoq6k15ijf5pif11bupv9c05/91344711748.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089aaef562b1---poxosizudiwak.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/52549189543.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1608d58b0e13cf---69142806499.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/r9v9out5aeguutg7nd225l6q75/fuvobo.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///26094426120.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/ec015843bfe59442301c750b82044b96/xatarizejivevuloxorok.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/70906836280.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160fa55e2881cc---52638418248.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a86098ffe---wagufopobafova.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/58407615209.pdfIn PDF document text
    • http://grupophi.es/uploads/files/rijijiw.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/18985607708.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/jasevexoxasibad.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/nixovokenezofu.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/90371c7c5bd00028613991c8d813c1dc/51974143908.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE797 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000ef93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AA 10816 bytes
SHA-256: ab24be6dcc44436a07afd8c8c27312ee886d6bc52739fc6ff5d6ca9e0ba7d2c7
font_03_sfnt_off0001209e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209E 20100 bytes
SHA-256: 741473806c86d17aa8b4cd5915f6d628cfe7aa14ab1ba2807ef0bdd3753445fa

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