Malicious PDF — malware analysis report

Static analysis result for SHA-256 c59d88015dedd2be…

MALICIOUS

PDF

110.4 KB Created: 2021-06-28 08:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5874d7a07dcfea5c4b0b30504925192d SHA-1: 92dc41bd85eae8554ce8ab3fb3de0ac46e000cbc SHA-256: c59d88015dedd2bef3fd5495d5925e159622fea678221db0e1974b0da649abf5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users. The presence of embedded URLs and the nature of the link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://divorce-difficile.fr/userfiles/file/27276353777.pdf
    • https://marwaautorepair.com/nbloom/fckuploads/file/89288133629.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/4694a2d745286e5498d8a2a577d88101/8224286468.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d6515b1066a---zazijurogajosofilovozogi.pdf
    • http://china-engine.net/ckfinder/userfiles/files/33738285724.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/e553236d5f0d472949b0b8a758ff7c3a/2888632944.pdf
    • https://beautyyaurient.com/editor_upload/file/45482391136.pdf
    • http://casier-a-bouteilles.com/file/11476889613.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16084897fbda59---42156379729.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d08b4c3b669---47898274063.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/a071fb8b464abcd612406ee73a86288c/32287875642.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/937c92d895abb7abe3b5b5af6406b116/filanenovivid.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/36c49ff059de85c8e6764ffa09ac06fd/34422819167.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/immc86gjt7mipri3o1gcmpeti2/nowabomezum.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/e7t5cjhdpdg2srnh9r3r654or1/sutesuwenegabaz.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d38b51cc4---megenojup.pdf
    • https://nutricount.cz/UserFiles/File/59603851859.pdf
    • https://biothiennam.com/media/ftp/file/72141055576.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/6c60f8273ed38e90be8ddc5999592316/momekakixedaw.pdf
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/bezulenanakugurefexevuj.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a403aa036---57158448825.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6a38f0860---81259856095.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bc58705d6---67743155342.pdf
    • https://circolodelpistone.ch/userfiles/file/fadedemisufe.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d73cce0e28a---bumofovabogeb.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=central+to+mst
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014a11.bin
6f229ce7b9f8e3865896fadf60aadace95c7b903846239807eed559b3cf3a424
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A11 10208 bytes
font_01_sfnt_off00016102.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16102 16792 bytes
font_02_sfnt_off00017914.bin
0c2ee88f34a3d3d4aa09368e6b2f0dc649ae569e36bb25a27b151b826d0031f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x17914 20104 bytes