Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b890f6d0efba44…

MALICIOUS

PDF

96.7 KB Created: 2021-07-06 00:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69f04dbba0230bdabdac94daef25a335 SHA-1: 8c79fcc1d4a25e56b693035749be2927dc370457 SHA-256: a6b890f6d0efba442d6a40112a636c2ad5bf4d82810be24023e2abe9d5ecc52d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://inwebjor.ru/uplcv?utm_term=fundamentals+of+electric+circuits+6th+edition
    • https://alakharia.com/public_html/userfiles/file/79813926855.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4e9b6bb67---24152437323.pdf
    • https://condominiovillage.com/userfiles/file/kosaresiba.pdf
    • http://ahdjcm.com/upload/files/68499922145.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db102e23f9---tesogaradogomekalifinipi.pdf
    • http://ahkjt.com/upfile/file/xafuduvugusoxomiro.pdf
    • https://decoveinvestment.com/userfiles/file/podabuvuwemizebesizebada.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/fcd1c9cb1b84d723bb7b009d6f317269/pakubazebabajikugelusixi.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073733d1058a---51482715790.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/ae6015a5843638174d3efac8044ffd76/zezupekuren.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/rosamisadetijer.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/nskktant8pbsk7gk633gre62ne/48174757196.pdf
    • https://elektrona.cz/files/file/86948875993.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/4e2e9630d19ee861df008ef1c0bcdcc4/zuwinapiwikelete.pdf
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/301735589.pdf
    • https://strechybenesov.cz/content/85265158869.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/vezoxigolarosaxewer.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071be0a59805---rowujiwina.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cbc1ad3d5---78798505354.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bdafed08f---gilazukoturi.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/na3phddcfct3lbav5nsginmjhe/gagonajomumiwilelijix.pdf
    • https://semut73.com/contents//files/ginejov.pdf
    • http://zulassung4you.de/bilder/file/52291087743.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9ce231e17---84047283769.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_off0001119b.bin
66952cc12869b187984b66b35945229daeb76a4479c6771dc6a160d0835e5b68
pdf-font-stream PDF embedded font (sfnt) at offset 0x1119B 18556 bytes
font_01_sfnt_off00014380.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14380 16792 bytes
font_02_sfnt_off00015b97.bin
9ed45f5f0a5fcfbeff49fa7299d1e4878a223132161cd1f3075f77bc1946b21b
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B97 10984 bytes