Malicious PDF — malware analysis report

Static analysis result for SHA-256 d92fb061090d964c…

MALICIOUS

PDF

69.0 KB Created: 2021-10-03 18:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e7b82f92a56711405e735469c9041d8c SHA-1: feee58e3f7386ac855521aba3f26e75eb7d91f44 SHA-256: d92fb061090d964cd9bf5d507234a425a2624c2cace633320dd76aedccbcb6c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely involving redirection to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://garglob.ru/uplcv?utm_term=state+and+prove+newton%27s+law+of+gravitation PDF link annotation
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/oq2tdbvo756n9opnkku68i6i30/zizuxevamidopoxire.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/fodugifozaxejunesofuzofu.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a20b31a2e---46537978535.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/82817316403.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/lazogosekuf.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/rojuk.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/9373437310.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/32354255190.pdfIn PDF document text
    • https://shibbirs.com/media/files/fawowosufivofudude.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/18200320967.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/61770931985.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/kofaw.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/binarifovumimipaxudomana.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/gokefigozejinuzibegevo.pdfIn PDF document text
    • http://marine-inox.com/i/File/noruz.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ca1cdaf0d---66711385585.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/96rs82j0f026rttok9ajbg6rn1/1210575199.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae3d91ba70---damalebowetofimetumuka.pdfIn PDF document text
    • http://namngonviet.com/user-/files/61549246957.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/bupusofomexabiraziwewevuw.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/1901833606613061394e87d.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_off0000afc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC7 14820 bytes
SHA-256: 4d3a3c20ad1af51af6c2263af954203762bb2c084134317ce4600795c358eccb
font_01_sfnt_off0000d4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B1 10932 bytes
SHA-256: bbaa73468d904a94d238fe01ed377a248febc6a249f6dfa84146fb77d4716a9a
font_02_sfnt_off0000ee00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1