Malicious PDF — malware analysis report

Static analysis result for SHA-256 6048ea0c726dc051…

MALICIOUS

PDF

73.2 KB Created: 2021-09-15 13:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a1520da76536d8d66bd339c3a53f081 SHA-1: b4207e4e21844aef2117bf558906503f13117e9c SHA-256: 6048ea0c726dc0515932e336bea3aaf516a12028a6927cdea63e06483d06cae3
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 websites or domains that appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' directly support the finding that this PDF is designed to host and distribute links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://drentmedischadvies.nl/uploads/files/48140494800.pdf In PDF document text
    • https://phukienbep.net/media/files/giwigavawefiwixatisufi.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/kilimivurog.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/77907002356.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/vemani.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e06cf24022---31256615586.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/24476835761.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/bumarevudiwose.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/87604315824.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/cc636sja2mt20a8lecro1p1tig/86612494873.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/20372863438.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de153c5ffa---5760508871.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/21958629252.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210906092126.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/58084496252.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/4739275411.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613333f89c5f8---xigemogugirimunokegu.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/gugumumemerugubisoduseg.pdfIn PDF document text
    • http://remobudostol.pl/pliki/64633656105.pdfIn PDF document text
    • https://777mto.org/contents/files/31663352382.pdfIn PDF document text
    • http://erex.hu/upload/file/80014656029.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/43590911501.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/ac65f6d70994436f43941a3ca2880e3d/xiluwexixipaxugufefan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=top+10+app+for+download+moviesPDF 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_off0000b979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB979 10848 bytes
SHA-256: e8fe7e306736819b3c20a5fd54f3a1560e616d5daa48062741c4a0b3908a7c0c
font_01_sfnt_off0000d294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA6 17296 bytes
SHA-256: fbabb04bdab248dd60a5dd4d8a51e27f4cc6cb8c552cbf4a2a07572fa6bffdaf

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