Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5ad52f9227fa69…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 22:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7dd460a39ebb7c13714e3953e21ce804 SHA-1: d783606416f0b57fd091803ef5e7032e8a32a8a7 SHA-256: 8d5ad52f9227fa6961249ed3a06c4e4539f9ccc382a1566371bb1a7f079c5d4f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is unreadable binary data, but the heuristics and URLs clearly point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/8voiedpshfnbcahdh65j89d572/buwiwepedeliwew.pdf In PDF document text
    • http://coumert.com/images/file/fepoga.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078ff1e0752a---11472792569.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/89299802255.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d9307ca0233---65381880330.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/mowufugadiwesupelok.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/ledonolapozunafogokoxiti.pdfIn PDF document text
    • http://pasted-radio.de/web/files/jozebezelikene.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/buxumaxupo.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/remozeladekikegawajaronak.pdfIn PDF document text
    • http://nhaphangmy.us/upload/files/xamunugazonuwelu.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/94973709168.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/lanuginosuxedupisawezoj.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/55l0nlik4fhpso2jo4ggccc3d5/jijisitituxore.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/a4721bdb7e8f460ad8d7d8ea3bfff03c/49870780629.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/1hi0a1f5pujqsgshjld1rv5908/genikefu.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/mupegu.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/kuwubobamubuzadunivogu.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6b3411104a0ddea5079925c95341fa0d/95003404793.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/48657853145.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/zopofub.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081807695464---11575906957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=elektrotanya+tv+service+manualPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/58659119470.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_off0000dc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2E 17644 bytes
SHA-256: ec79c7a3d9231a3f3ae0a029ea67a9e62ba8440ded622dd68bafeff230d244f2
font_01_sfnt_off000109b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B1 10748 bytes
SHA-256: 8a87247290a20b5135325ada92ae59bd6b0efc14b85b7a521c0808cbf81100f8
font_02_sfnt_off00012276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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