Malicious PDF — malware analysis report

Static analysis result for SHA-256 27359d6e31f80c29…

MALICIOUS

PDF

75.3 KB Created: 2021-07-22 16:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 96e5b51fe05dec59c119dfe5dc6005c5 SHA-1: 0efad311de6a2395e8f5f9bb5e75989ebd23e000 SHA-256: 27359d6e31f80c299d89de7d5ae3929e050952b8a788162d489784662ed1f844
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, hosting numerous PDFs on compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/23cd3631196ad8d6dfeb13b686f5ad79/dibevigotixuragexitewi.pdf In PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/45bacb2914b1920acabe5166e00aba75/gimod.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/dung933i005ijg9rej91rurkb2/mogozubuwibeber.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dd3866a00---potajuzipesos.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/67285551176.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d98ea53e9c---82905145688.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/45b8f26bd7f67b02178e07aa7082831c/nawitaxeve.pdfIn PDF document text
    • http://jogamiskolc.hu/ckfinder/userfiles/files/raludiseran.pdfIn PDF document text
    • https://aedwea.com/upload/foto/pofowititufowub.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/norakegux.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/9ca6f727ff377b50eee3897e0cec65a4/zikafota.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/82976254055.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/nutufasivojimofi.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/78285504520.pdfIn PDF document text
    • http://peoplefineart.com/assets/202107/files/20210720092546219850.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df36735bd7---kirewof.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/95274694796.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f4c1b83c0---vebadewaxudavabuxesoro.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/pajazikujako.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/02a7168e09543f110a91498ddd9ec26a/1498455431.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/7si5a5sj2421t76bfk57ct9gu0/17117358281.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3913bc901---batipikerej.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f40f4ded24---basinukumuzepobaditak.pdfIn PDF document text
    • http://kajsanordstrom.com/userfiles/files/nepekuniwux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=i+swear+to+god+i+never+fall+in+lovePDF 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_off0000c49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB2 10632 bytes
SHA-256: 5f9a41f6809f3b0e8639866c0ecc1a55e9e060b1f30b1685f3a5406db7a94013
font_02_sfnt_off0000f4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FE 16596 bytes
SHA-256: ea311ed9d97207376bfb3b9ad427feaf8e3857f96e844a835e97e01b6ea0bef8

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