Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc17eb192b9bd215…

MALICIOUS

PDF

77.7 KB Created: 2021-09-01 17:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5d35d0a19d20f90324a3a9cd09ed1051 SHA-1: 7471a1cef852e7619d647d9fb2029f1fb04f1fe1 SHA-256: fc17eb192b9bd21577348444403eccc0860eca28dd60494c56ff9e536ca34433
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains. The embedded URLs, such as 'https://infrive.ru/uplcv?utm_term=wishing+you+a+speedy+recovery', are likely used to distribute further malicious content or phish for credentials. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=wishing+you+a+speedy+recovery PDF link annotation
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lunujubadoguzedopomasiwu.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611ce51bd6eaf---ripezakowixowexiviwuxesa.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f151e73870c---79716717343.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/vawaw.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/makewemud.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a0f672882f3271b44025933e3e737c97/fizejejoxejukebavawex.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/58228965771.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa6dd6c15c---10682695821.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/96163561843.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/70241708653.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/nutekojabazezaginedifekib.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f04e32350---dajovifulenukigulawoke.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/jegupabimerugadelavejakef.pdfIn PDF document text
    • http://mlight.cz/archiv/file/xibesatexoveneb.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a2f1427d6---21882917096.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/1401848294.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160871e0368e39---73472675675.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/34715010982.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/82480458370.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54c1f2eb56---74136803341.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/2e5092f6c2168028772a9c84f98e7ebd/81089052617.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_off0000cc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC33 16888 bytes
SHA-256: 35c9d2925fcc9062ae00305ad579f223b8294ccdccaeee9ca2e284d0137cac51
font_01_sfnt_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F97 10924 bytes
SHA-256: ca4488bf0604155847ba908bea6b4fb1688ad9d4e31cb03c94adf64cd3dd5544

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