Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0385b5f3b43e56c…

MALICIOUS

PDF

138.2 KB Created: 2021-08-01 02:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 28784ae7202cb18adf2831855eb7aeab SHA-1: ddaf7fa410d603aac3d6d019814c107fc42be54a SHA-256: b0385b5f3b43e56c34d4898edb5c9223cd1ad4a2c27183aaf6af1e3627af5c7a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised WordPress sites. The presence of numerous links suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9708

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://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/c98cfda02e70385459558172d63d2712/gipizun.pdf In PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607238f91531b---29889756049.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/vorasuxol.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/23842506493.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a626255b639---wokasesogewuwujupufid.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///mogipukavufemenarigadawov.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d17b709e38---diwutebisoboroz.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/nepigasijiwikabo.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cbdff2aa941---59606086833.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/kekito.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/603025otljnpfhlnju8omuqc2d/66664311058.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/86529624900.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/71818758400.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5429a9d8194de14765debdb5dec36cd/solonawi.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dae5dc89574---zozoxa.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/35584859371.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/27517910538.pdfIn PDF document text
    • https://laps.pl/userfiles/file/47444393791.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/96838910325.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/molowuzujop.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b871ece4a08---ribivo.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905c1e9d91a---60243966450.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a640eb357ca---neruvijikovevejufifuk.pdfIn PDF document text
    • http://cpils.com/userfiles/file/10599513429.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/7mue6d6t87pksf795madgsjg23/6436275709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=%D8%A7%D9%84%D8%B9%D9%86%D9%88%D8%A7%D9%86+%D8%A7%D9%84%D8%A8%D8%B1%D9%8A%D8%AF%D9%8A+%D8%A7%D9%84%D8%A3%D9%84%D9%85%D8%A7%D9%86%D9%8A+%D8%A7%D9%84%D9%85%D9%86%D9%88%D8%B1%D8%A9PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001aaf1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1AAF1 34252 bytes
SHA-256: 3975884945e7a6de17154dfa95a2feabab6687bf8561d49c2ba54ec6577c9f17
font_00_sfnt_off000183ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183AD 15276 bytes
SHA-256: 51ef4b42beb93a29ffd257718de1a11388e168feeb4f572ce25d483ff90540db
font_02_sfnt_off0001e667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E667 8984 bytes
SHA-256: 1155eef8b03fb48db8196c62fe92ea0367c3129ef5e52290f3da045cb9446085
font_03_sfnt_off0001f897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F897 18832 bytes
SHA-256: e57dee8e5448987e4cc70177f1b4fa4999b8f90eccec74e298d81a66772fa64c