Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d7415e9462ca54…

MALICIOUS

PDF

83.8 KB Created: 2021-06-25 02:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6931121628941b97d925591547779960 SHA-1: 47fec8e468a3d822805cb3be17a900eb38c79e9b SHA-256: b9d7415e9462ca54938895c6493b1c3cc6011546d96824fa7ce863259798f3d5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier. Heuristics indicate it contains a link farm pointing to compromised CMS uploads and disposable hosting, and importantly, it includes a lure for clipboard command execution. This suggests the document is designed to trick the user into running malicious commands, likely to download and execute a further stage. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160960542ee08f---13893087526.pdf In PDF document text
    • http://meble-tk.pl/userfiles/file/41401238761.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/95375012126.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a06338af744---29083723328.pdfIn PDF document text
    • https://eslms.com/userfiles/file/44518714716.pdfIn PDF document text
    • http://palami.by/images/file/jeloxupevaluxelalonurew.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/c6skjea8ulprj6v4725pqvpj30/3088493623.pdfIn PDF document text
    • http://capri.lt/userfiles/files/73448251217.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/hnoq4vmeo6pvb3eamn4e9tffr5/95370540971.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/verixasonasa.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/90d8bbd6eb646bec2cdb0cd96b45e331/72620317915.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16076bf8da8576---64560056751.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/5d1k4h0el9v9det8ok2p5fu5m4/labulanijevekesaguf.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/30191221732.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16095d8a1840e3---24759298169.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=macos+sierra+virtualboxPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAC 5068 bytes
SHA-256: dcb5bcf15e4508cf6b4b6471e4bf6863de93d324f4a27e063a4131351ec2bb01
font_01_sfnt_off00010fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFF 1940 bytes
SHA-256: b783188157a3de6b1a1a195d96e9e3e5a78c5fa77f3acadcd9a912231279d9e8
font_02_sfnt_off00011937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11937 12024 bytes
SHA-256: c1e29dc04ad3a5a0e23174e2cb04464b9c7802f39c99d8bbab79bfaa45f053f9