Malicious PDF — malware analysis report

Static analysis result for SHA-256 82470f43492b0c95…

MALICIOUS

PDF

80.4 KB Created: 2021-07-25 12:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b97b1efad7f8bf6805426099183223fb SHA-1: c01b73cd4635374a3e45295c1e7a1c45f2d46e48 SHA-256: 82470f43492b0c95f098b14712e700218b100485f72e1c9e0087867823d81d5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to compromised or disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL distribution suggest the document is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://duda-tech.pl/dudatech/upload/file/tazalixoruzedowizuxubi.pdf In PDF document text
    • https://cometsecurity.in/admin/userfiles/file/95600800606.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/53374706909.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081593702e4c---mozetavagulabete.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/guxalagegafewogu.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/58312822867.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/vewifaxuxamodudij.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160974aede5b52---numudaturejikogoxa.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/49601468728.pdfIn PDF document text
    • https://medtek.vn/storage/file/69939841340.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/vanekotakatisebizivuwofax.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a76404d29---21253152925.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/zirofozewujusuzodozozumo.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/kewasudaxumil.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/f4544224dab5f9d698b6fe98ea4ee95b/8244968369.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cca06699e58---koseramowajawivofi.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/33482429142.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160752dde71239---zepusabokogawapazuwuvuku.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/6qg7osrt31kbleiqsm9ll4bid6/90701123073.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/tagaduxirirujijep.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/rebevikapunerapizulos.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/712dc768c3e9177b92ba5c059d6d2650/37669275110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=kenmore+elite+oasis+washer+error+code+ldPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC591 4048 bytes
SHA-256: 63efd5a3bc02d7c4785488771a75fcc5b4d2962d8e635bd07ddcd14065db0108
font_01_sfnt_off0000d593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD593 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA5 17584 bytes
SHA-256: cb722494e145749daa1650f566a31805e40b7ae01c377f2b982730fc1e9b3af2
font_03_sfnt_off00011a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7A 10712 bytes
SHA-256: 4c50d736e9c614275da3c072f24d92a45d5c851e6b3335dfe4741ff504d8e8a6

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