Malicious PDF — malware analysis report

Static analysis result for SHA-256 9845e34217fd6677…

MALICIOUS

PDF

90.3 KB Created: 2021-08-15 14:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5e2ba12bba18738da22ddadb65c152fa SHA-1: a13bb1f06534c27a4175ec2d842f54fc20183786 SHA-256: 9845e34217fd667747ee23d42bfd861dd6d386c2fd92add9120c1bc094885cc9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further malware. The presence of a link farm on disposable hosting further supports a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://bienbao.net/uploads/files/32423628444.pdf In PDF document text
    • https://brigitte-farner.ch/userfiles/files/28236787912.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/75f683418bf5ce4f18d30f2e9c00502d/6307876582.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/resib.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/31097971466.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16270198661969504711.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4461697911---zisonikepedotopewojizudeg.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070b39beeea9---63990621698.pdfIn PDF document text
    • http://espressoperfetto.nl/app/webroot/files/userfiles/files/10704896267.pdfIn PDF document text
    • https://akbaturgame.com/calisma2/files/uploads/reredibibikagejiposegopi.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/21459092115.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/s9csmiun4ldb7fovt21i7qbgo4/36591205082.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e7f69c89f---xupimufuwawefemaso.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/25434125641.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d773a63308d---pugoninizegozavalofepaxan.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/37ce471b2849acdf06c70af3daa1c0ae/fetuxinopisexi.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/t2f8rtghqk08v57i921ihjt03g/48621497318.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8cfc9b178---47081519767.pdfIn PDF document text
    • http://co-mit.com/uploads/files/pazexi.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba53b0f9cf---2670670011.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccaa70e5825---fabikofopoguxixijosenixom.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b009659b8b5---jizavapugudanogiboxunu.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/325091304dea43c0cae18cc722ca701e/vukemalewukaminadik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=amiina+al+mufti+pdf+somaliPDF 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_007_off00013e70.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13E70 17932 bytes
SHA-256: e4636be8ff6ee4173ebc8d6e74add964f39826f675545410e426885d7a0f0db1
font_00_sfnt_off0000ddbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBF 18824 bytes
SHA-256: 67909474200e4b1da22ce701285dfb040af2f5c8df7ac43f24ab30f1a453b986
font_01_sfnt_off00010e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E87 10508 bytes
SHA-256: 767ae06c48f77fd4b8774dbf3836bd05f6d6fe515eb5dd2ad49fcff870a568a7
font_02_sfnt_off0001265f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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