Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe9faf12966b3c8…

MALICIOUS

PDF

128.4 KB Created: 2021-05-25 12:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71eaa182d8b83c7f467a910d67a9d335 SHA-1: 8c2d21fd34511a3ae1b7e8aa588245318b13d6b0 SHA-256: bfe9faf12966b3c80a05d778fa78939e97de8673c4ea618757901919bf953104
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though partially corrupted, contains a title related to identifying fake products, which could be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 http://hgbs.de/userfiles/file/jiwuvesafigigikujuko.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/046320e58bd0525e2c41df5497cc9a92/89258543292.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/38234377157.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/87b070848b09812b4ee42967663c0e67/41614924071.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/33a5f514f766f18338251f582a807d8d/88929039256.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/4fq6sron7ihcufs5rbag22qb6i/wokosegulenogab.pdf
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/a5eb2a0db8073f3ea88e22aef569e4fb/lununavopixufudageborutu.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815d836c093---pepugokikafejebosenuzom.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9e0d15d15---6626326980.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/862a896440c0044d8de25548c10fc248/pixiromoginolegitafokivin.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082cb6822ad1---76627365480.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/67daceda665323810d575dfbe6f97a6e/97570335710.pdf
    • http://birzebbugastpetersfc.com/files/file/pusinifetipusobobolozobu.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/7a7404753580b4dd57306230cfbfc5a8/repikuzufezer.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a96ed34dacb---26688933324.pdf
    • https://systematix.pl/userfiles/file/domutato.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/15f2a290eebd5ec3879a4be47ee3c267/vojevoxirexikumomakovika.pdf
    • https://hanahana.vn/media/ftp/file/15568080082.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+know+if+your+air+force+ones+are+fake
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bb64.bin
58f556d9439ea63bc3debe03848a1dd8b1500acb8ba49905eae64f3ffd134881
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB64 5064 bytes
font_01_sfnt_off0001ccc7.bin
4769fbd6997c38e2d08bc21ae68b27e6761dd355ec5ddd74dfea9bf4af5d2add
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCC7 11696 bytes