Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c71cd5d07092947…

MALICIOUS

PDF

71.6 KB Created: 2021-09-01 02:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4f9e34178dd06a352567221aeca93724 SHA-1: 9a7e58cca70114765172aeaf1a021ed275483627 SHA-256: 7c71cd5d070929472f11faee528e15608ecd63f50348d9681693e4f5bad62756
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=wire+rope+catalog+pdf PDF link annotation
    • http://rocb-ap.org/file_media/file_image/file/teximuzevazuse.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/193f0a5326d6156f49ba547d98782051/40370374377.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/suxofatezaxividegituwinab.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/62342011695.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da8a2a1fce---xubafig.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/15422469963.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/dirurukofimupex.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/680d374de75c3afa94ccd03f8e105ef8/widejiloluvopujan.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/virelis.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/71871050468.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/gowuleramaminuwifibin.pdfIn PDF document text
    • http://holtfamilyreunion.com/clients/5/51/517903a0238f10651a3d170edcbd2d86/File/ramidimur.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/45887448600.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/37250898853.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b82aa4f1c---60581236207.pdfIn PDF document text
    • http://belhavenhighschoolalumni.com/clients/13962/File/28536070440.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/jomebogilovovuful.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/gesevufetuni.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/81632094904.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210818_FD3C3458F5F47AD6.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/36040531983.pdfIn PDF document text
    • 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_off0000b87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB87B 15956 bytes
SHA-256: a6c16b0f452a533990462f53a076d263071ee6f3b34e60606c5cdfb7d587db97
font_01_sfnt_off0000e1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C4 10516 bytes
SHA-256: 00b9ba956f5e4988c518295933659e835afe94a55c4ff8ed9e07c43472296db2

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