Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb12290b1b6cddc…

MALICIOUS

PDF

91.6 KB Created: 2021-07-15 19:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1426ebd8da0fbde179d26ee9d8f93978 SHA-1: 0bfcab8acb5215c93e53cab84bbc5b653e64bea9 SHA-256: adb12290b1b6cddc2ce04ce9dcceb383a6f72d54e350baf6cc56cfa64f3c45b5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting domains. These links are likely used to redirect users to malicious sites for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://texmet.pl/userimages/file/6411063682.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/aeba78f83cc9e592eca652d48f6bcbc7/59617802044.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941eeaaa6d4---mezanagenazoruxagabi.pdf
    • http://studio-castiglioni.com/userfiles/files/60996145566.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d20edaff4---ximixatokesedamipimowenu.pdf
    • http://magooferta.pl/uploads/fck/file/wiwenamosemujo.pdf
    • http://gchsclassof1970reunion.com/clients/6/6a/6a45fbe13d63dbb0eb8070d7cb9dbc89/File/25661803386.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771a2223abd---74409145080.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/3cff6b72a5e0ea5b8900715b1929b25a/42072708576.pdf
    • http://np-laser.com/upload_fck/file/2021-7-10/20210710152010436620.pdf
    • http://grawerlik.pl/userfiles/file/53962892079.pdf
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47275529254.pdf
    • http://xn--szabowski-tub.pl/userfiles/file/xubojesawadukegaguxilin.pdf
    • https://cherrychile.cl/cherry/uploads/contenido/files/kukofibe.pdf
    • http://rialta.ie/userfiles/files/sofejawonatujapinisiwa.pdf
    • https://arrayamed.com/userfiles/file/xirodexebij.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad225ff3e75---78644363527.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d7d112ab0---jagufifose.pdf
    • https://pasarantogel.com/contents//files/zositaro.pdf
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/nuterasesizon.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad05587b307---93715094672.pdf
    • http://learnazia.com/fck/imagesfile/ripado.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=day+6+30+days+of+yoga
    • 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_off0001014a.bin
8a54693dcb0ddb720091a4b6a79b4ee560a721a2592a804113a46c66d799c8bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1014A 18832 bytes
font_01_sfnt_off00013191.bin
453c593837ee8d819d32e987c3921692685a1d5643009333ed405e4212aaed52
pdf-font-stream PDF embedded font (sfnt) at offset 0x13191 10532 bytes
font_02_sfnt_off00014986.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14986 16792 bytes