Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde4f49a6b200631…

MALICIOUS

PDF

84.4 KB Created: 2021-07-03 03:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 21f568e36422217554778f97cb41ca41 SHA-1: 1f8f9f239617dcefa2abd5bbe4167d50e29e4a01 SHA-256: dde4f49a6b2006317eff8879c08dc8104eba5c327d774fdde048cb6646306d97
196 Risk Score

Malware Insights

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

The PDF contains a 'Clipboard command execution lure' heuristic, indicating it instructs the user to copy and paste content into a shell. This is a common technique for downloading and executing secondary payloads. The ML classifier and ClamAV detection strongly support its malicious nature. Several URLs point to compromised WordPress sites, suggesting a distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43fed8b3bd---47567089632.pdf In PDF document text
    • http://biotledlight.com/userfiles/file///94845111924.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a486db7cf29---4655558680.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/75cbae1efc5e44cf289e077f596bc0d4/fanifutu.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/rizilofujuzekoxebuboxe.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/67133119679.pdfIn PDF document text
    • http://dichvuwebsites.com/media/ftp/file/zoxapapugumerugupis.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/wafalirunotibisamizovijan.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e1c2bb799---13178538308.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a675a7b40e9---pugilumufekikutirubi.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/b57cae9bca379e35412409defde24748/lipusesot.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/13913308762.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077901b9d0b3---57316076348.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16096fd55d2b10---1881493600.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/f6b036fc55ce2c3daedd003c1bb07904/genexaramokatosalusizo.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/wifigivubawakizimekeg.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608deabbcfbd4---gamasivomifagem.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/wiparaxase.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609466faecd06---sodapivosikijadixijel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+combine+a+few+pdf+into+onePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE62 10684 bytes
SHA-256: cdeacb02f30e5816b1dc7a14b43594aec2e9c1db1aba0a3ea963816547b3161a
font_01_sfnt_off0000f6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A6 17308 bytes
SHA-256: f361dfeb7f8b06a5deaa373a6852c7c80796f9a204bf0810fadc9281320bd362
font_02_sfnt_off000123f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFD 1696 bytes
SHA-256: 266b75d8d95edd4e06796966e43e1bb0a7116b249193fb313f1988fa9bd38e89

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