Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df766eee9382045…

MALICIOUS

PDF

120.7 KB Created: 2021-08-14 02:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e6c5bc511c1a6dca91852fa5482f9587 SHA-1: 35d67fc723f19ecbeb7e81a961d6b2c6de07d380 SHA-256: 4df766eee93820452094cf0b4175b85b71b1dc00ba5bb7354fba77d69660e06c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as these are common tactics for hosting malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b123277161b---benirodivegosoj.pdf In PDF document text
    • http://davidhammerstein.org/userfiles/file/18422627979.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/43830215992.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/bumagamun.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/849643e4e31ce4574875ac73317617f5/sofezilofepalati.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/896ee3c1fe918e147b97bfcbce6f09b6/40564015653.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/3aa8c752550f743f9d1eca6beee99c46/nirativilazajekumegodif.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d2b428d0a---jukefakusixalasebasosiz.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/tilowujobin.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b63b1233e90---nuramazekapefikivuwireso.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/loxagizup.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/72769335642.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607446bf02ad5---rateropuzipelotapekata.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/35266821768.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/94969204442.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/majubad.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/3990091838.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ff942edd635fe8d01ca1b757706bb38e/xiviwamekeruwadujulokeg.pdfIn PDF document text
    • http://ipllaser.in/uploads/loradaniwasoxodobu.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93bd36ae64---94442718831.pdfIn PDF document text
    • http://armanetti.com/images/39655683320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+duplicate+tnt+in+minecraft+ps4PDF 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_off0001734a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1734A 11036 bytes
SHA-256: af1890c72670bfeb8ec39749286dae37240c4872d0b70285aa21f85a1c5a5166
font_01_sfnt_off00018cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CF9 18212 bytes
SHA-256: b3c4caa8c80433b46935f8aed45674c7886d8ea657f42f16b4eb6adbc3fad0e3
font_02_sfnt_off0001bd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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