Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efdcb1a7b6a3348…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 19:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65494dd95fd0cf59661531f49549479d SHA-1: 6f7f36ae0c638d8980e9679e675b2596992ce80e SHA-256: 3efdcb1a7b6a33489c4b5d2d1d433623ee14de3b994f3da925163855659eaee4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics suggest it's designed to redirect users to malicious content, potentially exploiting PDF vulnerabilities or serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://sashtraayurveda.com/ckfinder/userfiles/files/59242559344.pdf
    • http://unseretochter.ch/images/file/80189141959.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/ef192c201230fbdf8e387df506b7d002/luxegetezurakisukemosuk.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/2f7242ee857c738433c0393574220169/jumegutezalofima.pdf
    • http://austria-ex.com/images/blog/file/guzizalanuxi.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6c6261a94---lagagixizoxubanarevuseva.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3ac3de7ad---78068899035.pdf
    • http://rszm88.com/upfolder/e/files/20210721204430.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/7c3667a8c572f2e6c07d787920ff11eb/68874968867.pdf
    • http://socialsipahi.in/assets/ckfinder/core/connector/php/uploads/files/2313144924.pdf
    • http://jinxinghotel.com/uploads/files/79908259645.pdf
    • http://amandamaitland.com/images/file/68689787801.pdf
    • http://kiavysocina.cz/UserFiles/File/43118362987.pdf
    • http://cipetbhopal.com/webimg/files/6952242348.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a377d2184b4---27127194982.pdf
    • https://batikatravels.com/userfiles/file/40130959177.pdf
    • http://grandinhr.eu/images/user/file/79625022219.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/sh0g2fq96v0di6ipdodddn9p3n/bozomafupotutimime.pdf
    • https://digiconelectronics.com/media/kizevajexidizek.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbf5e212b1---79648213597.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/8a0ba95a7eab1336977dbf1e6d02daa6/73893517430.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/14oppomuecfgatiks97u0o8k2e/ruxededoxemepom.pdf
    • http://vietsonplastic.com/uploads/userfiles/file/jofazagi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=spring+framework+pdf+tutorial
    • 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_off0000db6f.bin
95991e708598011c9d2a3c25b3385215b426e908d4268bdc533fc0f67443b10c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6F 17224 bytes
font_01_sfnt_off0001081a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1081A 16792 bytes
font_02_sfnt_off00012031.bin
922f279eb2668c29f51aec4fcf06d63afbdbb8ec0c7f1b29ba8508d5bab28018
pdf-font-stream PDF embedded font (sfnt) at offset 0x12031 11024 bytes