Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffe65159cd0b8205…

MALICIOUS

PDF

95.4 KB Created: 2021-07-16 13:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76ab49f227d65f08d8a9acde9b5a7b68 SHA-1: 31d2f0c0b47c98b0d473db2f4128f571751ffd76 SHA-256: ffe65159cd0b82055dd9b0e39c5d083b51afeeba3a3ebad38eaaef3edf3bbcf1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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://crysiq.ru/uplcv?utm_term=centroid+of+area+by+integration
    • https://cornwallstaffagency.com/userfiles/file/29303313143.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a649df1da44---75607636442.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607638dda9c71---devaxeterukowonoxu.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc8f169cad---27520928646.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5efb2e8ae5---97648089871.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/60ab1c85733a87db83b7300d2976d50c/21055130562.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b75b13d232---fuzagotupimozibola.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/tgfqn88kpsqksbpp56qkq5p1c5/27038134160.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/sasuguviwuratojiwalin.pdf
    • http://avgdesign.com/userfiles/file/91856925105.pdf
    • http://xn--aknmedikal-yub.com/uploads/file/jenamijumezijizukarozev.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/9ecc389ad41e0860c2df90aead81592b/sezakexibot.pdf
    • http://technology-mp.it/userfiles/files/rokopimunutenamafubal.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/9ca09fb03ac9bc12d6fcb0e2c43b4b52/50982076969.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ca3021b1e---11393556931.pdf
    • http://baldonimarcostudio.eu/userfiles/files/46276638656.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607beaa9aab2b---59147152393.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/adbd56ff6f5e8b8b0e8d8eebe69f5663/85846256181.pdf
    • http://safeabortionnepal.com/userfiles/file/81693477304.pdf
    • http://www.aadhar-interior.com/userfiles/file/sunuvetes.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/deflchi8p9qmlj7om9es0m3d2b/40652445557.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f44540e66---gamapuxakopufolibe.pdf
    • http://cascinamana.it/userfiles/file/tudunawevofadediz.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/k0f4l1541vr8urbo5i18dtj36d/befagotojifulovinog.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/pixojoxuwemu.pdf
    • http://dgjinhak.kr/DATA/upload/files/202105281044187878.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607829cbaedc9---60048978987.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB34 16792 bytes
font_01_sfnt_off00011346.bin
acbcc756459e9f864246d2531be243aec9eb831f9630a2c040afae1cf5dec9e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11346 18204 bytes
font_02_sfnt_off0001434e.bin
325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1434E 16084 bytes
font_03_sfnt_off0001587b.bin
c173b8295a27bb7f5061fab3bb675aea6cba1ba6f095832b32f6f8474971770b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1587B 10600 bytes