Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a6225abac038102…

MALICIOUS

PDF

86.5 KB Created: 2021-07-10 01:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 80b6c1eab98058ddcb92733fa8fb4da7 SHA-1: 15b7d7518cd9db20dda0134ce245897bd973bd70 SHA-256: 2a6225abac038102d327e4fafc77604d292e7a09c246ec6925bce1a1eb6d9d63
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The embedded URLs, such as 'https://archism.ru/uplcv?utm_term=windows+7+professional+32+64+bit+full+version+iso+download', likely serve as lures to direct users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=windows+7+professional+32+64+bit+full+version+iso+download PDF link annotation
    • http://baigeleather.com/userfiles/file/bopiwebezodugefujumepal.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8c6477f22---98720694579.pdfIn PDF document text
    • http://atek-ent.com/upload/file/sinidel.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/6448948b8471b97d20fb78c8d62ff058/zexofolexizen.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/06/file/dasabax.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/56e2aa9f035b084b8542a82bee737a05/38836942749.pdfIn PDF document text
    • https://purefeeling8.com/data/file/vedopijagemug.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/dejagapubiluve.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/11f7c803043145bea418e41e293e04f4/fupaxoserumo.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16098c5ca17874---naxoze.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160de1fc93cff6---rurutafiferubusuwalatedam.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/gevplklvh47fot1ghi59g816t1/59860592190.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a42f3862b09---41894371539.pdfIn PDF document text
    • http://crediramasrl.it/public/file/jofelujeditelisikanodu.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c171244f28---tabaru.pdfIn PDF document text
    • https://actor-conseil.com/files/file/solizaginabikazu.pdfIn PDF document text
    • http://jar-ted.pl/file/pugozijorufupiwawuku.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c860bf9b049---74909930076.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/rulofizotasovuwodux.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/104fd4b4bfcb6bbda0f424a68ecb6642/46698084361.pdfIn PDF document text
    • http://hitoduma-d.com/files/files/5221797629.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/40706264125.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/11anbgqmm76oltmrpjjogqia8j/teton.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609da9c3e0b35---noninazeviranutij.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_off0000e6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A7 11464 bytes
SHA-256: 154cfa20d052caeb18681b16c9705ea76195fcf4b026ecd8a8c2e8ba78bec452
font_01_sfnt_off000101dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EF 19256 bytes
SHA-256: 7fdace4ba600ab7ad7c22c193d75ee40c45bf44db02ace37f3b1a3d3b75f19d6