Malicious PDF — malware analysis report

Static analysis result for SHA-256 27698085cd5b92d7…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 19:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 61be171f8816761ea41d5a9ba4ce0922 SHA-1: e96268d7c084715d8f45be8f16cf930051e8dfc1 SHA-256: 27698085cd5b92d74378e184eaf1f23062ef1a2d46db27888417505dcd074c2c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://apra.pl/files/file/69572022707.pdf In PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/kijam.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/vakurivimadupavo.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/bilara.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/kivifegotanelumunaponij.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/mamudirefixewe.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/5533038588.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f7965769f2df49c6212b7e50dc67f35d/23888555152.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/98182036881.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/72930543107.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/10657914221.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8199476f1---68921617009.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/96aab23133b0c3c4538f3d8a5099495e/popomomotalos.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/21204958976133bba6b50a0.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ef9aef6f6---31084482090.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/90365736171.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/29979357959.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/zefasuzobisojoseserebugo.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090601474655.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/majumifudakofotukopunul.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139e23adf0---53117954506.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/23348768516.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/gozupuzizizul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=android+clear+app+cache+and+data+programmaticallyPDF 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_off0000dfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F0 10888 bytes
SHA-256: d0e4de576b318be169e7213a5bf15aea2f559ffd88f7ae023ecbf277dcf6d40c
font_02_sfnt_off000110bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BB 17612 bytes
SHA-256: fbc30ab99a5861f6422e17d4ad4505c2b001b80f83ca3a13d05726e77bc48c4b

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