Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88968cb9201ccc7…

MALICIOUS

PDF

82.0 KB Created: 2021-06-28 08:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 470cf7abadc9a8078db77bc11fe2e194 SHA-1: ccd94eba117c3a919561c2cd559cc113f8bcd745 SHA-256: f88968cb9201ccc7a195590bfbf4de3f61713609d7ea969732f757e3f7491778
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the presence of multiple suspicious URLs and the heuristic findings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/80074096356.pdf
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mavigafunadole.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/3171e588eda28ce95cda79a2edac128d/77250361547.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092f99f39728---64143796932.pdf
    • http://rauvuonsach.net/images/uploads/files/gewirivapakuboluwaxo.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160790a6383563---69560993702.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/4ef37e2c388376b573e959e25d8e5245/27852265772.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a335f242db6---99441420563.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e68b6aaea6---gugawaroxegixukukitojup.pdf
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/liperenapa.pdf
    • http://cyuanmei.com/userfiles/file/vamijobuzoduvi.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/7b5d6fe14e3411e42e42e2a4e5b3e165/bujemugam.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/1f0c1375850ce54aea791c61801fefe9/90130742961.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe180babf6---25123080106.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/709901bad5f3e70a19999160acdd1fab/14997626834.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/e08ff9af9435d93ec74e3ffb5af7e3bf/fixenaremugamu.pdf
    • http://premiercontractinginc.com/files/file/2418352883.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084280c32f16---kunuzulavezedemepob.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607af8ddb49c0---fitat.pdf
    • https://et-auditing.com/userfiles/files/sanaripuga.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c43c5d538b---88603011888.pdf
    • https://yourownadviser.com/ckfinder/userfiles/files/9246927442.pdf
    • http://geredekombiservisi.com/userfiles/file/12246496370.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=either+use+in+english
    • 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_off0000e0b8.bin
f5cfacbf7018c188c68a2f91e937dbbdb6e4a5c807e29d9dadc8484d391cd615
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B8 16672 bytes
font_01_sfnt_off00010c07.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C07 16792 bytes
font_02_sfnt_off0001241e.bin
7c91f9add6d6da7c25a665e93da15dac8429549d8edcd88d18c9eb176efc194d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1241E 10188 bytes