Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e038e296a9efb1…

MALICIOUS

PDF

71.1 KB Created: 2021-09-26 01:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1e669a3c49f18c737ed239bb3e022450 SHA-1: 3e92108ea6d078bfc872156e7e44bf92f7b9c18b SHA-256: b9e038e296a9efb145efba25e3ff59849505a6e2c137068c444da455eefed335
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://chcial.ru/uplcv?utm_term=android+memory+full PDF link annotation
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16145ce01621ac---sabosegufebev.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16139810ae5197---7424502037.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/7afa0c0ggmsetbl3mfbj8sspub/vosesevupamawa.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/63007731190.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/20117795113.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/77438111945.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/42608833826.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/mewemovegumirevimipalut.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/xavirapupudomukoma.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/pujedizulamabulovifigo.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///4632420935.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa1ff108d---13423046618.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/moxajoniwokijojuburu.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613e38db7b09e---narowufesasufot.pdfIn PDF document text
    • https://pindimana.in/uploads/file/vopozavoxavo.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/96010333705.pdfIn PDF document text
    • http://hanifeugur.com/image/files/pexikoralopakudiwame.pdfIn PDF document text
    • http://emannsltd.com/userfiles/62332723525.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/regusixepuxo.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/27303149680.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/zasagenem.pdfIn PDF document text
    • https://ibextrail.com/editor-images/68594769867.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6F 10284 bytes
SHA-256: 1a28fcfce86b0c6838c46d9e339259218d79dfac38155c465d9a2504334518a8
font_02_sfnt_off0000e17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17E 18044 bytes
SHA-256: 5f435ef0456b533af14f9d06bba2ba2221a6259f5878a4401856d6676c23fd40