Malicious PDF — malware analysis report

Static analysis result for SHA-256 501aff712ee325b3…

MALICIOUS

PDF

85.2 KB Created: 2021-07-04 03:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7001147d3eaf980a5e0123fd85c8726e SHA-1: 823d1a6919e08b60d7ef7e3a99d761996b777c88 SHA-256: 501aff712ee325b3a8602e2ee6a609d6e8799400632318e107c70117520df66d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external links, many hosted on compromised WordPress sites, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware distribution, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=conditionnel+present+exercices+pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076925837bdf---77685610039.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/1d17b0a4f3681156de4f93475cc439af/bikezemuzegubugofibi.pdf
    • https://serwisnawigacji.pl/userfiles/file/11412614483.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f70467e24---77903325807.pdf
    • http://www.psoealora.es/ckfinder/userfiles/files/11300256016.pdf
    • http://globalbando.com/DATA/upload/files/202106162248174406.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b528a3b86e---xuzogikuruzebutun.pdf
    • http://ruresept.ru/files/file/34826405789.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/69cfs07mr0cn49pcdlvj6aobee/wefovojudefubane.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ae72b2a6b---keturinatuluwe.pdf
    • http://jandebruijn.com/uploadimages/files/rovevixitak.pdf
    • http://aarogyamedico.com/userfiles/file/52571409032.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/agbb2q55nh8tcc65eocdcpcanb/vulavirixe.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082de076b1aa---tinatup.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/7ced11fb71749e33d5ab49c1cff0c970/doposufugirunajek.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/6529f8f613f69639ddd314c9fce2e7f7/lojatesujevor.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/93b33b568f8c02743583629fd7e52ef3/tofemewakinada.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/c5f2d0ca348cc8afa59681e9770f5768/bukipumifa.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84681c5d88---masez.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42da378ae7---1237813423.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3664bb2d4543351420b64b4b88b41973/66022937923.pdf
    • http://doks-films.com/pcms/content/file/20559970385.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/559756b2e01a3581b8a8b1ead2a77591/nedevuwajusojajo.pdf
    • 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_off0000e63c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE63C 16792 bytes
font_01_sfnt_off0000fe4e.bin
713db41234a8b53d541b1aae70c7a4963c9814826edecebd5eb9f333ad5eb411
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4E 19364 bytes
font_02_sfnt_off00012f42.bin
bad5a05db8c5b2651f493b80057e3a83a0efaeeb225dcac47ced0acbc970ef8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F42 10584 bytes