Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e746763b54b24c…

MALICIOUS

PDF

95.0 KB Created: 2021-09-08 00:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e636dcf40ee71f8f842c872af567f068 SHA-1: 2738753bbfa5240b06fe11848a40cbfe1bd6d97c SHA-256: b6e746763b54b24c3e230a833a113db7096648fbca518b1a9ac4b5eb813a2133
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs that point to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites for phishing or to download further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF's primary purpose is to act as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=gabor+filter+tutorial+pdf PDF link annotation
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1799b640d---61967320085.pdfIn PDF document text
    • http://thaide.org/userfiles/file/51628328027.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/xamezijifizisujaku.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/gosigiwudorija.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4b7b9bf7f---pebapagati.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210615_142625.pdfIn PDF document text
    • http://ezibra.pl/upload//file/83325692684.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/nopuzejivirudedopafojil.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/2400885265.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5877dc27c---13352569440.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/misoxebakogetolumelid.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/96280941783.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/pofefumem.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/51d517f71959bc24294bab26887046f9/firorin.pdfIn PDF document text
    • https://armenia4d.com/contents//files/49263790089.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa76a51a79---gidujiw.pdfIn PDF document text
    • http://sial.pl/galeria/file/46831462984.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/7sbd6t0u9rqa62rojglqvelh23/84484680067.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7875641c3---14244664704.pdfPDF link annotation
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8922364f6c---zibaraw.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/virupibufiletap.pdfIn PDF document text
    • http://aweibel.com/Photo/file/59209699346.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/jometebabugo.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6e2d944a9---kafipizevela.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_off00010653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10653 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E65 21300 bytes
SHA-256: 50f315fd3ba820ffb0dc9abbfd8b7ba0fb5deebf2d37216e798086340b75efca
font_02_sfnt_off000156e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156E1 10496 bytes
SHA-256: 6c17e9c94001661da698459157d6dbffe635e5d58ef86253af64ec3b14e5e8f8

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