Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d95a426c6d33d85…

MALICIOUS

PDF

87.5 KB Created: 2021-08-19 07:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 71ae8f6b27689126875713050d690c7f SHA-1: 92b0b423aba8a5ed561f1830c6b905ca574372d6 SHA-256: 4d95a426c6d33d858bb88583abd5d07a60547814250bba2a72c5e8a0ce1cba0d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external sites, many of which appear to be compromised or disposable hosting. A critical heuristic indicates the document attempts to lure the user into executing commands by instructing them to copy and paste content into a shell, suggesting it aims to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://infrive.ru/uplcv?utm_term=how+to+list+all+commands+in+command+prompt PDF link annotation
    • http://nmglyxx.com/userfiles/file/fuped.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/u3rpjv9g2p0tmtoep892vp5d21/xamazip.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/47240068628.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/pebisipazupot.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/nugowanifolesuxebatexaf.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/dejuwolezejowex.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/88812480391.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/95962355321.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/gasadopomadurodi.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/jariwikax.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a0193fe3506---sozapa.pdfIn PDF document text
    • http://garderoba.sk/images/_file/79629825637.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7eec96f0d0---rapinigusexugufijagezet.pdfIn PDF document text
    • http://epoetryworld.com/clients/53741/File/fekipil.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/25891401148.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/zemopelovajetidudifa.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/2326451656.pdfIn PDF document text
    • http://rurisnet.org/images/file/93055945046.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/6fc1b22a45aeeaa7eeb33dd77f409b84/kejesonig.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/c0a2b761d12601daf12c6f4841360385/96304297377.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/dopagetuxadukes.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/379c817c3bf8b8f6be0386ef45470436/puzixukidudebolimos.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8471e9c46---zudoguziferakakigovus.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/xefiwu.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076f9a522cb1---25929922285.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_off0000f05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10873 10620 bytes
SHA-256: 82d8c2100a7b58802368590d955530e40dd281af8253338c4b28cd4c42ca59cc
font_02_sfnt_off000120b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B1 17020 bytes
SHA-256: 1799d94c60129240de3d422a997c31c4d42fd0ffb092a880f7885fb4391ab4a5

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