Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fdd31f2bca45aa2…

MALICIOUS

PDF

90.1 KB Created: 2021-07-05 04:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9be0114b84bb7e15e44c5204ba179ce SHA-1: 28a1bd98cbe0bc3e7be6a6170cff68fa650c5140 SHA-256: 9fdd31f2bca45aa22efc68ed5fc2bdbb0197520afa14940c40f87857678907ed
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://cihangirhotel.com/upload/ckfinder/files/kelosabuzanazidemi.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/c7tk501j4o7m3rjgqana935ut6/45106003840.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/284e84171482724ba6e586142a0f1752/redimarazilafe.pdf
    • http://bellina.pl/userfiles/file/73897676089.pdf
    • http://drukarnia-skawina.pl/app/webroot/media/files/kisanavomev.pdf
    • http://turagent007.ru/userfiles/file/tezajijuso.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a3f284811889f58d129a0fa7cb5fd604/gewigojot.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/xalomuridumudexowefuzo.pdf
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ade634da731---11714584950.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/vree4dgohsmaivmev52pj913cl/wuxonufugotakofedonil.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/i32jejs8f1vrmccba2uvf81dv6/12498488032.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607660cba46fe---78415254665.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa5ef0db2c---fuvejupiroxawutijufiroxa.pdf
    • http://seamcc.com/UserFiles/files/fifedo.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/16oe6k1kk7c2jtoe8fp425mvr4/josojezaleronuxolusutel.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/7944660718841ad6e1be0c7d29d05413/66329763378.pdf
    • http://akinmedikal.com/uploads/file/1906308403.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/cea84412663483f0a86e55c6e6241d8b/32615305748.pdf
    • https://scalper.ir/data/files/file/zexixi.pdf
    • http://apexibd.com/uploads/fck_uploads/file/87220671961.pdf
    • http://optykglowacki.pl/obrazki/files/89050172826.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=animals+that+have+sex+like+humans
    • 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_off0000fe3c.bin
2955c32ef7a1b423c099ea3a58c989ba3d92f9c2287358ce65eeaf5ba906a791
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3C 17328 bytes
font_01_sfnt_off00012baa.bin
7767444d8328e9418219745d7c8bdeb0ede92adae846e1cc2cc21f4b52564540
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAA 10496 bytes
font_02_sfnt_off0001435e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1435E 16792 bytes