Malicious PDF — malware analysis report

Static analysis result for SHA-256 f29b8384e5f52ae9…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 19:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c1516d67cbf5f569fae6da4695e9b7d9 SHA-1: 67d195989c011661926ee9453a373e17d20fc466 SHA-256: f29b8384e5f52ae96e813fa10a939cd5f4e43d6caeb1d5c73c046e64701f2233
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://electriccityusa.com/images/fck_uploads/file/nebizesejo.pdf In PDF document text
    • http://chelseafoodmart.com/uploads/files/fudiso.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/tiluboninosefof.pdfPDF link annotation
    • https://tennis-samara.ru/img/file/sijulid.pdfIn PDF document text
    • https://adikmanis.com/contents/files/wulujedodaxetanaxa.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/g22vm94mhasd2gnph9m91mi5s7/titakamafemevedixi.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb7803c410---pulinawugili.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/65542284700.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/zewip.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/xuravesegakowetepenin.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/rodizobajafejobum.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/33796896426.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/28345574497.pdfIn PDF document text
    • https://expomediainc.com/upload/file/bisuro.pdfIn PDF document text
    • https://breedlife.com/upload/files/neveguniwalane.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/10464223020.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/48680430551.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/49215727694.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/86293481266.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/jefuja.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130dc9e9ca35---63411037390.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sisiviwuw.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/wapenuwelukol.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/tozinidovotagulagabi.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/24019014671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=leer+codigo+de+barras+en+androidPDF 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_off0000d8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10D 19064 bytes
SHA-256: 3685b71765be9c871f36616a13582a58a57cf1421bbe8167577186325809ebe0
font_02_sfnt_off000121d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D5 10500 bytes
SHA-256: 7f91e58550503b68ae9997a59d329a005ce95e3bbf3d74bd06bc257ccede295c

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