Malicious PDF — malware analysis report

Static analysis result for SHA-256 7746b2edccf5db99…

MALICIOUS

PDF

96.5 KB Created: 2021-08-02 09:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 24888902cec02a98ab5dfa0e9a0de606 SHA-1: 66a11cc77e94ce877c04b67a1aeb226626b5fd99 SHA-256: 7746b2edccf5db99f31cf0a4c3207ede6d56ceb9415ac179de5bca7f2074bb26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF acting as a link farm, directing users to compromised WordPress upload storage and other potentially malicious domains. The presence of embedded URLs, some with UTM parameters suggesting tracking, further supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/blgheur6pq3i8jlhmp5nu74k85/sinubalovite.pdf In PDF document text
    • https://alutat.com/data/file/93786375171.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/14859456191.pdfIn PDF document text
    • http://nutrisoilvietnam.com/upload/files/bobevaninagafewodomibaf.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/287f4f752e0dd350a5617cc7be67f9ca/52516145012.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/libidemiti.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/giriwagidupexoko.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/robevovuvimibedovifara.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/45247335696.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/q3vgvljmuro7bspi0sm5ng29un/46202991360.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/bb8521f48d076ca9bc28120951da1887/45110077549.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/7034539814.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a018d428c7fc7c72f85085c01ce105a7/temojogewilaketumukatug.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/9a22cece33516fd4ad9743e194ff9ba9/19132842458.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/0osg2lcr2okrmlrv2vthebqb6i/24817573222.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160e624845ad49---93420424349.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e77a2bdd3---juxifusadowupupekom.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712d9c3e946---wibiduvugi.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/58779170965.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/5ed9bd0998cf5fbef3c12b6b6a90bf78/tajorelarizi.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609e90128853b---76998393619.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/81408297927.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/kccnvhbcsbphefijvrbidjcpqu/98887271076.pdfIn PDF document text
    • http://yejida.com/userfiles/file/33316314838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=probation+period+evaluation+templatePDF 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_off00011638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11638 10692 bytes
SHA-256: 967982c0767e006b9e5413c71fc80adf6c2fb63f6696666814750950a4c73c17
font_01_sfnt_off00012e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14689 16960 bytes
SHA-256: ea224a3d291d736fddbe2ed569d01de656d5bcaddb55beccfe3f8794ba2b1a7c

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