Malicious PDF — malware analysis report

Static analysis result for SHA-256 005f7befdb7ffb9f…

MALICIOUS

PDF

85.6 KB Created: 2021-07-04 03:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 038cd0a26fb3f50a2eb881527d21137b SHA-1: e7977754db56fd52739e536dfddd45d6eaadb0e2 SHA-256: 005f7befdb7ffb9f58669a95a51110ab8607b9cf26a07d185dfa2f5187b3ac36
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. It functions as a link farm, with numerous embedded URLs pointing to external sites, many of which are hosted on compromised WordPress installations or disposable domains. This suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://queure.ru/uplcv?utm_term=multi+step+addition+and+subtraction+word+problems
    • http://taiwanglassgroup.cn/userfiles/file/xobemazonixapamavule.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/884efab8285e51a366538858d68a132d/82978256717.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/39c663d5f82ff1a4cdd33d5c20180979/nafozawizomul.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/7a6d9dc75445f3903554abf01c22e8be/61819565939.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/7fce680533e1018079b278969faae036/30638408731.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/99817bfbf48203395771223a104c3e2e/50337378432.pdf
    • https://nanyangtextile.com/userfiles/file/nixilazobakorewis.pdf
    • http://7seapharmtech.com/Uploadfiles/files/30017919678.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b787b489c8c---fotigepafaronejaxa.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/fumruilfa2co3qcfandm573juf/wirivenojukava.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3c493ee7---54976508678.pdf
    • http://parentini.it/userfiles/files/48988858918.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073624665429---60775898679.pdf
    • https://agrimal.pl/userfiles/file/dapetaroniz.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/1o01nchh0evn4p5l429jlsreet/17397476306.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e00dc18015---88131766425.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904e8d66433---wugesajinolitiren.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070879f2fb9d---fagobexizibagu.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5c2f97bc7---77880492553.pdf
    • http://airconbank.com/upload/fckeditor/file/45262887641.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae82e437afc---99772290214.pdf
    • http://decamiones.com/userfiles/file/vuwitenagodeguduwisujax.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_off0000eb01.bin
c743ba24f89be5ce725ab6de3eb032c10313889add272b170ea64fa5cf157295
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 10992 bytes
font_01_sfnt_off0001045c.bin
e5c9dfa1c78894449951e68c5fe033602e5d13205068a85cee8c5a4e06d46f5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1045C 17120 bytes
font_02_sfnt_off00013124.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13124 16792 bytes