Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c191d2d1885bcfb…

MALICIOUS

PDF

76.0 KB Created: 2021-09-18 18:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 773da43c1835b6f362e7bd7bcda198dd SHA-1: 18d26d7b60c1ac1fd72530b1ea132046dee6c3f7 SHA-256: 3c191d2d1885bcfb9da57b3cfb735d10d985357173d8673936628a812d44f4ba
164 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute malware or phish for information. The presence of a 'download button' lure further supports a malicious intent to trick the user into executing a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=universal+adb+driver+for+windows+10
    • https://jcmimoveis.com/userfiles/file/xidapajusinaf.pdf
    • https://hunde-katzen.at/soubory/kubaje.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161348a0eebe85---ratosisoxagazozo.pdf
    • https://nieruchomosciprzetargi.pl/files/file/40223094855.pdf
    • http://hanauhrova.cz/files/59423021081.pdf
    • http://ydchem.cn/filespath/files/20210914073307.pdf
    • http://masan315.net/board/imagefile/file/benemabituregefolopuwoted.pdf
    • https://art4you.sk/editor_uploads/system/files/vagadojatog.pdf
    • https://ladangmimpi.com/contents/files/sabowi.pdf
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/78287538523.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a254417961---89238046168.pdf
    • http://proclima-membranes.ru/userfiles/file/36674924006.pdf
    • http://bellina.pl/userfiles/file/88549731643.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c5b4c3d78---tutomorunepebilabegid.pdf
    • http://doradcyprawni.com/images/pliki/ligik.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/ropiwev.pdf
    • https://taucaotoccatba.vn/images/news/files/zojasaxele.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/6i8o81kvlpei8ta4s4rj9p0vq0/rexujumujenoso.pdf
    • http://skulpt.in/admin/uploads/file/78768193594.pdf
    • https://jagamimpi.org/contents/files/rozem.pdf
    • http://rc-modeller.se/images/file///10503356960.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BB 16792 bytes
font_01_sfnt_off0000dbcd.bin
effa88587eaaf27171b2692e1e826c5f64fde6f17193c20ccf73e989525b61d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCD 17640 bytes
font_02_sfnt_off000109f2.bin
252c40ab05dcf6eb7ad6e281d3f554531cc4d2f5ceddf4b45da5b48f49d5fcaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x109F2 10724 bytes