Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d079f355d4b5aab…

MALICIOUS

PDF

89.1 KB Created: 2021-06-28 20:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a1b4b4b68772b8f851c736087649c48 SHA-1: 184e96d18a0e067798eaf570cc90dc2239e599c0 SHA-256: 6d079f355d4b5aab7c6799bc44d6aa835cf258461700e0160871261e585c492e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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=cause+im+just+a+girl
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/37671274a318a0db440062b80e54d4a0/93971495569.pdf
    • https://abhimaninteriors.com/ckfinder/userfiles/files/82791574580.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/9e3177e324fddbb604e1393af0c82ce7/pamaruxoberilafu.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c8817e4824c---31475405058.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/s1j9ukq96dpgq4g1qkp1keq973/33770902078.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/333a1fa39a8deb79419500f863f134ae/92661390158.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/b589687a90e17e5ae05ed69dd6226a58/ruvopokunolame.pdf
    • http://learningkey.org/userfiles/bizomodekasugosoxa.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/10fa7e91b8d9284065980a379467878a/nodefuwimokiwam.pdf
    • https://hgindustrial.eu/userfiles/files/56918972667.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608606464a4e5---42269863842.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b08e62540d0---nudedaranabesovu.pdf
    • http://novussiteyonetimi.com/uploads/file/bigajazapabemixumaditunot.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/5fd14da0da551ea41ecd354f91b1480d/5469006565.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/2j3ul35kccu6gsh42l061ovn84/burifugubojifusubutabivi.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d3d72ef3c---vodimepusasibuzedeveniluw.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/gij9kspracktih0g17o0osru8f/83111317993.pdf
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210526044321.pdf
    • http://guides2alpes.org/uploads/file/74133018367.pdf
    • https://vokalensemble-vocembalo.ch/userfiles/file/13363951569.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/5f23370ff4676d1ca585bd91bed775d6/64449448966.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e70683e1b---22949226119.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080140648d68---palumolamotasabamug.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_off0000ec6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 16792 bytes
font_01_sfnt_off00010482.bin
f2dfea912e3a37428e4afffecf8978c7bdf25be30fb1d6a0867d4fd6f2d99490
pdf-font-stream PDF embedded font (sfnt) at offset 0x10482 10488 bytes
font_02_sfnt_off00011c53.bin
59980ac37286824a0b7e4f9077c578d4417e055049adad286bfd278356a870fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C53 27308 bytes