Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1af2c11f775fc9…

MALICIOUS

PDF

74.5 KB Created: 2021-09-15 19:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a8039cfef2507832d0e4b8ab7474fbfe SHA-1: 80d04168a4df61388aca790cea4fd734ce207ea8 SHA-256: 8f1af2c11f775fc9022943daed1cab94cf1270c4f9c480a07ec7d1ac53795d98
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://weldingplaza.com/files/file/12264950457.pdf In PDF document text
    • http://romengo.com/ckfinder/userfiles/files/lusigazagovulufumeg.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/38454521943.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/7385168998.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210911_342F391016938102.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/nikuguxelulizixulur.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/mixazudozuvel.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/96122790111.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/11615912984.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/59932733320.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/wikagabepigedokeve.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/xosorije.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9ad617ec---98679082829.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/kukirefijugagine.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/44211495688.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/xejatikogezaturujavutex.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/xemonak.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/ksp4o3nh0q8jjpci17n5tkkuhq/bamiwimewisujadibuferigob.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/kemosisoruja.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/mogafajodokukemujanisori.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/gewivekap.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/44139192220.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/80054049736.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/60046546636.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/664ceb708bec5b05383b2893463ebc68/7634993018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=five+nights+at+freddy%27s+2+apk+pcPDF 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_off0000be44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE44 11136 bytes
SHA-256: 5811acf10a38e4a58cf1b3cb33b3581167778aa8e14c79438572ef7537367b1f
font_01_sfnt_off0000d826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF038 16436 bytes
SHA-256: 593d431f62166452c6c8487f96e1181b23f5540c6902d44444e6c63b88d8d58a