Malicious PDF — malware analysis report

Static analysis result for SHA-256 7004c6653125d47b…

MALICIOUS

PDF

150.4 KB Created: 2021-07-20 22:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 222bf1eeca224384481c7ca6e742b4ac SHA-1: ae82e7462c4ffbda6c266622fa446f538ed60a74 SHA-256: 7004c6653125d47badc38334316654d9b6ee187c28298b8b9f6952e2af3e9033
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cf7741102---ronawoforejoburariza.pdf In PDF document text
    • http://gancza.pl/userfiles/file/32335431632.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/18347914410.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/92124639388.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/20444307696.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/89888320217.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9346d7ae94---20894306113.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/23063218028.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/61797398109.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/25899495120.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/79786800681.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608609f6d6d18---bepamarusoweri.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/2990a42b74791196b9927bcb3a4347b6/nemikepujijo.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f383a4039b---22541300102.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfefb5bfdaa---53593268158.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/buxejipalonepesikaj.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/66812110264.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06a91ed258---20699568119.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/c5b993d5b8f8dc386b933d5ca52f9f30/xokutudiporodufoxizag.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/lonekebakone.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/od0n81s2pja5k48oud3g6sel16/6283433466.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608453ed6d760---48748117486.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/c89c64a05e6c11fe5e5147f145eb5871/birapavimonevelojugatav.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/lak2qh1jv21n023p95uq7mgrp7/40199246002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=do+not+answer+a+fool+according+to+his+follyPDF 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_off0001c8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8AC 18756 bytes
SHA-256: 96f0beb5364d5a6290accae421433b2db981e9ef261f8b06bb98fa004df5f5cd
font_01_sfnt_off0001e7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E7B0 10956 bytes
SHA-256: aa2decea422dfe4cf0cf1cde66694321e4492f38939c76ee98a205147cd3e3ef
font_02_sfnt_off000200ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x200EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000218fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x218FC 20008 bytes
SHA-256: d3c408ae220a24caddb677625ebcdeead46e1be2ae23bed66b450daf579ce4f1

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