Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8fa17b2d51d6437…

MALICIOUS

PDF

87.4 KB Created: 2021-09-06 09:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a41f04de5f2c2b5050c22047d44e4b4a SHA-1: 6af11aff924d1b695739e96912cf6a8e136be304 SHA-256: b8fa17b2d51d6437627baba95d4f5052317b79c5214c4687c9250c1a0e8a2326
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c2e4c200ca---17412440962.pdf In PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/e0f1fab6eef76c0b414aea32bc4cdf00/mavojif.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/2g2qrhf2ennims5k7hcf87mdi3/jonoxavines.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tkuo5snl1he9eb2ep28eqr1i91/jutixexigotefemekegidi.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fffa475512---77038535898.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607becd9cd3f4---dopowaginoboxod.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cffe272d3d---lipuvugap.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/98810919504.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/64683025184.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160df8a810456e---zumikewibimakadan.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/22650362605.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/wigobaxosasixaxof.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cecf6b859---juvazinewuzaje.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a39a328362---fikotamiv.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16090e43a6c5bf---fadubasoxozagal.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/40658489155.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/49172596150.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/92538739830.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612791cc6dc2c---kudefenemabumezoruboxukag.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/funifer.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d5cd7f75287---83249019141.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/sosolirodo.pdfIn PDF document text
    • http://nprofit.hk/userfiles/54340534296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=common+gender+examples+pdfPDF 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_off0000ed0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0C 19028 bytes
SHA-256: 27a485bab43df3175643281fe9e244feb64afbb67534fe662bf440476803e6a7
font_01_sfnt_off00011eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEC 10784 bytes
SHA-256: 01751b0be65a3c9d9955b08ebb08d197f4ed6ac6e1271ed8238ce482e7c390b5
font_02_sfnt_off00013790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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