Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3bfb72695d5716…

MALICIOUS

PDF

84.5 KB Created: 2021-09-03 07:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2d9cc02969249bf5573e321f06cb7fbe SHA-1: fa3edb9e389b72687cd93c2c5749ca9a11a6fa47 SHA-256: cf3bfb72695d57165974ca629bf2364d75abb897cbc32fd59e9c379ef106f6ae
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to numerous external URLs, with several hosted on compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ingmarcofaedi.com/userfiles/files/48420598173.pdf In PDF document text
    • http://www.logomarcanet.com/userfiles/file/didusisevusozewujujufut.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/42870755136.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/t1bpnvsk2emp98o1j8fsl5fe9j/gilixomekom.pdfIn PDF document text
    • http://hasyo.net/files/file/mugin.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094aaabd27fb---wexetu.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/34460457368.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/5d977f74ac2f504cf6add5ccc8d856b8/33857053759.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/54578933128.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/e3d40a402cbddba3728ba0ecdd1abab3/53345983291.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607df49a4230a---45200680842.pdfIn PDF document text
    • http://ecole.ru/text/images/file/5617644862.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/9c0ae1e162451939006a99935857bc03/13629472798.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611633e711d1a---musibivapekizopete.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/5704jpe84iimht3r92ik81gmde/2488656056.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/ff1e24dd9a2bc04124d71cbea9a004ff/felakaguso.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8396c1a6d7---78399809922.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1088059148---66412607665.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/10842149637.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/67838083799.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/eb1460ce3f564f2fc5825e76ddf59efb/fugimudo.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/bixivexibedezasaporazinun.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/54368920183.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/bikenukefuzobinatin.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/elp32iacktfr5sndge3ktrcef6/42306033178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=democracy+and+illiteracy+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F4 16512 bytes
SHA-256: d3aeef49a6fb4ceb8e5c72acfd7c45087f82108577b26428686d90260e7ad906
font_01_sfnt_off00011397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAE 10728 bytes
SHA-256: bcb9657ac07bc5e3f8c78b8003522294b10a45255780fbdceb842fce6cefbb69