Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2d1b96bd25e73d…

MALICIOUS

PDF

78.3 KB Created: 2021-09-08 06:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 95f9bef66e319e8a12dc1b0d6dee8ab4 SHA-1: 1b8cf0a77dd63b08c5e3bfa25ed04dbd9ee535d0 SHA-256: 3f2d1b96bd25e73d7d61887d408e7e1c7cce6152ff271e194591f7e1187c3ebc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for phishing or malware distribution. While no scripts were directly extracted, the nature of the link farm suggests it is designed to redirect users to malicious content, potentially leveraging embedded JavaScript within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://pistant.ru/uplcv?utm_term=mcgraw+hill+algebra+2+common+core+edition+pdf PDF link annotation
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/45d84a9d55a0fd3c90b8d8a96ec75173/gikubivabeseniv.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/gixesubijiveputuwune.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/v973uv2achgn3urpefrnl10och/19890177680.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6739154fd---95380725008.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/10096258287.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/kopabutidiwikobire.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8ae328ced---3303437820.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607081dc9fa59---9475854547.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1629591034.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/1b2ecbe0948cd8d337095eb8c77106c1/xifogaxagixowulezeruxizi.pdfIn PDF document text
    • https://halkum.rs/files/21421095690.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bfbd9b3ab---60582298567.pdfIn PDF document text
    • http://dzbnf.com/upload/file///85357371242.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/teruxazaruzudonomijegatu.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/25220457259.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/pemasefafemijegaxi.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/wuvapakaneb.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/e528fd9ee305ea683fe6bb396dd7f800/18135445522.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850e32c080e---gasepodegi.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110992cd44c1---53973509007.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/nuzulubi.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083333f28e7a---poberotej.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/e13a60ec879d0bf9648890c6c6115bde/pevuzudimuravanisab.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_off0000c6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF00 11236 bytes
SHA-256: fddaff8c1f142a785d9a7146f71242935664c51afacf967e4567f9c1fb7d7ae2
font_02_sfnt_off0000f8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 19944 bytes
SHA-256: 51c90a68544266daf260ac7fdbd2fb32eb311f3c2019b4d5ffddba2145bd3e74

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