Malicious PDF — malware analysis report

Static analysis result for SHA-256 327bb156df9d3f57…

MALICIOUS

PDF

93.1 KB Created: 2021-09-01 15:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 022fd2ca016eb7e05556b4d743578891 SHA-1: 9c66e9e03faf23a3b8525887310d59fd88427f73 SHA-256: 327bb156df9d3f57b3ea3d539ae628347cef82a2ef1f95ca87ddd039f669e814
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://galantemontagnana.it/ckfinder/userfiles/files/68024845465.pdf In PDF document text
    • http://patanamachine.com/imgUpload/files/ranujuxusabuju.pdfIn PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/bibusaremafadeditobag.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b81e963ee9c---23042287583.pdfIn PDF document text
    • https://biocoils.com/img/file/72935538952.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/2c1ece12dc94655507ca77f69a620711/womexemuwose.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/60281987901.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/lajewobofumewepa.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/92846936714.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/foberasanodogob.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610e2e34c1944---23921038387.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/j9jdn37gj0buem09600k60idf6/35919313289.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/voloxetakukerugapamovu.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/57447903751.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/83147692740.pdfIn PDF document text
    • http://d4scanada.com/clients/8/81/81a8d3ecf29e0a7d9042e8364394d873/File/xedesijigigewusigedewapev.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/70021592385.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e82684d48---vanodemixejapebisawuvele.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/bopokekelagige.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adc62dcd791---9511451824.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/c5b45ce92f43156832ddaa3dcd813355/falikowimugejiwizuf.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/kiq6a6qdakbs594fjrj0uia2a6/nazowanoserarosap.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/31473704042.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/85236590173.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/67799011941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+long+is+graphic+design+coursePDF 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_off00010377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 10872 bytes
SHA-256: 1ac1c09d16476b17d5293260ae9e7669e211781e9a5f04c97bf5794c3c00f333
font_01_sfnt_off00011c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C52 18992 bytes
SHA-256: fbdd70e8071a479cfa9e39f16e1a74691554d3f317f78f97ec620624f3a20ee8
font_02_sfnt_off00014dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1