Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a169a205ad7caa…

MALICIOUS

PDF

90.7 KB Created: 2021-07-02 11:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d040b22df6d6a721989d6df54142eb57 SHA-1: b8a71b9132dc40e40954e14705e70ad8d8e20854 SHA-256: 85a169a205ad7caa8479431ffc5fd0955e1659ad7d3d7ebf20ef90a352a6a485
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of ClamAV detection and ML flagging strongly indicates malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to exploit users via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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) or Microsoft license-boilerplate 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://smidgel.ru/uplcv?utm_term=payson+lakes+campground+map PDF link annotation
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/57j1ucb7kor7su7kgdckgpu7f6/butapusewigig.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b354691cd20---dunusegaxodil.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/8f7n2n7tu70660aeslkt6a56n3/33522238112.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/q11q05a5ehar7g9dr4rvsp9auj/12353151808.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/jiberazukode.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/frhn6uiqmkpabqgvdrfdn5vt0i/32021378026.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4010496821---guxesujolevifasum.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/561b254fc37059096f016181555fadc5/2699352946.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/gewibawasazi.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16098447186aef---59275932471.pdfIn PDF document text
    • http://erictex.com/ufiles/files/zitisunagivajod.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/15242808551.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740fe86c511---pexatogewobov.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3573b9c51---vofopota.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a0dd02348c3e66e2b59113ae74209575/37513760082.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/a977fa92775eb93948bf8df339f88840/datudebas.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608781124a09d---zamotenadepatinopepefi.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aacbd946c---gikufikiwekulepi.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/sefukirimez.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/87500612419.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160deb9e0849f3---bosesonawokotikisaveki.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607000a8eeb02---dojanixijobowilokid.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/83275304740.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078d632ddfb2---sominosotesaxevuk.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160923ccaef97c---xirox.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_off0000fd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11540 17844 bytes
SHA-256: 38aab43286ac0e293b073a1535ac3bdb0cada8b935a25eadd68a3463d464b2be
font_02_sfnt_off00014411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14411 10976 bytes
SHA-256: b1924f2b4b32e76cf3e42f49fce792342ca44b696ae59ac1069753ab98d4a52a

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