Malicious PDF — malware analysis report

Static analysis result for SHA-256 8617f5ad861811c7…

MALICIOUS

PDF

92.0 KB Created: 2021-09-20 20:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 584cc57b513a6ac020014d4dec5d39f0 SHA-1: 901b3c5eb82128b6cb2d7121842bacf0756f1e4a SHA-256: 8617f5ad861811c7eae2e60d9a03be57fe1dae5d05dad05beaadd8fcf4f6e628
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with several heuristics flagging it as a link farm pointing to potentially compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links suggests an attempt to redirect the user to a malicious site, possibly to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142dfdd695ad---zavatelagedes.pdf In PDF document text
    • http://fishingas.com/userfiles/file/30167587323.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/runipolelulodadunavoto.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/fogurovemimiv.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/vbcp8of9mr852jpleo89016k9a/xanabufowow.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/puvoju.pdfIn PDF document text
    • http://peoplefoster.com/pliki/kowevexise.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/ziwowojojiwiloxapasemopo.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/26008405433.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/jugidexivir.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f424549fe4---6433748471.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/gumimeduxilanipedidix.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/0baqeqikt3jouik70k023kosj7/65409206289.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/14788721031.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109131802558926.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/63587678883.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/lisuxupizebobugubiru.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/64078458386.pdfIn PDF document text
    • http://ymmicro.com/files/files/kilowamotanasavanet.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/vewufawimamimexij.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///sajuvizopa.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/dekujoxagujelid.pdfIn PDF document text
    • http://hkacca.com/userfiles/lemutiloforedubowuna.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109040444087455.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe8971317e---52253840387.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/gikeminaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+autonomic+nervous+system+is+divided+into+two+partsPDF 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_off0000ffbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBE 11064 bytes
SHA-256: 6bb4b9a7cb800d5afd30185998685448c9c79be9a6d2c668d18e2cd7dd67fc64
font_01_sfnt_off00011961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11961 18520 bytes
SHA-256: b6c48cc5f06325bd7680b8aaa9e56d151b4d0c7ae1efde4ff8af43cd37135fad
font_02_sfnt_off00014983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14983 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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