Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bdfdb5d670ac39e…

MALICIOUS

PDF

89.4 KB Created: 2021-06-28 19:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: efa898ff4b16a09da0220119a3e2e723 SHA-1: 175b92dc985b5e608e1babf701d032077d43716e SHA-256: 4bdfdb5d670ac39e64a53a6c720de95983d526a28e5468579b101f5f3c219e78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/3852e7c7a6b28621c03e7f91e810d850/vevawezomapavuwofafepomiz.pdf In PDF document text
    • http://wamer.org/userfiles/file/63990246290.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/kobebifiwef.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b640f2793c3e6e0ea835376a696962dc/bugigibomebezimerepulu.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/lokanojipotekuzujorenep.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/87903977092.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/kf5159pb5djs11j949eijjk742/67990923100.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/85663880872.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5a3142b4b---fefibixedazovopopetu.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/76686467998.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/45546072384.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160786d74509ea---15738930382.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/14706559722.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608053deb973b---1822803153.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/trttch1pkpjnj8jvvk5m9qh4p6/zezenerutebirusenajavugen.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/3667238989.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609067ca31f85---68262945313.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/38534228666.pdfIn PDF document text
    • https://advik.net/userfiles/file/97477476451.pdfIn PDF document text
    • https://securitydm.com/slicice/file/junigi.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/73220749539.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdbe2ab11c---16664791194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=chat+with+strangers+apkPDF 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

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_off0000dfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBE 10572 bytes
SHA-256: 7a79389b7e0869d59a1f41f2c7854dd740e0086b4af5b8cc00ef81070c5d70d9
font_01_sfnt_off0000f7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11004 19796 bytes
SHA-256: 13d8f9ef135357ac34bad6436f7a172fe65fb11df71e4cc2e1368ca520cd6698
font_03_sfnt_off00014199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14199 16484 bytes
SHA-256: 6f430452f896d133640ec4979c61596893a7990046fd3dd09ffa4c0f564bf50c

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