Malicious PDF — malware analysis report

Static analysis result for SHA-256 b731c90d175dc3c7…

MALICIOUS

PDF

94.6 KB Created: 2021-09-02 16:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 78005da635036df5da39512b7256dc86 SHA-1: d3c8dc47a9e23abed8b8efc074d2881229150316 SHA-256: b731c90d175dc3c7a194a1aaae8321b47ed312692219814c6429b16d441cbf4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://irlanc.ru/uplcv?utm_term=condyloma+acuminatum+pdf PDF link annotation
    • http://www.domplit2006.ru/ckfinder/userfiles/files/vibapamofunureru.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f17d69e108d---35958875953.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/89098359197.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/cl70gmr3j3i0i6leutjepurfcv/74756621782.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/fad1fff7694a91ec03ecf7739224f0fb/xugamefozaninudexopas.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4753c60dc---sirenozobe.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/69045591162.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/157071056.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/354e4fe61dbdf7194aca3ca7b31a129e/70503867198.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/pokikojizubumir.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/17648088230.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/10678976787.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/72071728295.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161255dd0b77d0---84853871491.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/adf9f7f7cf01d20ebfe5008f9cc10661/39361453776.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/logemagewi.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/berefumojuzig.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8fd9e20b76---52166242822.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/cd9f512783e92995ba01dd52f97fa2d3/dixorirewomalinutafol.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ee39402e9d11e81da1a33ce38dd5cde6/44478521202.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/rumozam.pdfIn PDF document text
    • http://s-box.biz/upload/datoteke/fotadukuneg.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/485e8c3a85550b076ca02f8c09d69f48/59322602530.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001002c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001183e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183E 23564 bytes
SHA-256: 377899241ef6f7b6f3cb0f8b06df3c7e0569e4d7957eb249d2d03072800303fd
font_02_sfnt_off00015457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15457 10628 bytes
SHA-256: 02bbb866afec3a5bff62195a0d16cd4cd308dad79c7a018d9d9dfcc7fa8639ed

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