Malicious PDF — malware analysis report

Static analysis result for SHA-256 050eedffff1d9c04…

MALICIOUS

PDF

155.8 KB Created: 2021-07-07 08:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 42d93ee13ff003ec0bfcd5356f1287f2 SHA-1: 2740b99e6af4cd13b05b227c80aae162035f696e SHA-256: 050eedffff1d9c04c4c0924c49c9358808c454661f022e2c903c713a7500bc83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9741

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://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/emqpj97kg2g0gk4pd7a36k6ake/37884269176.pdf In PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/deredipezuzefex.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/24281824609.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/mikegazadetuzabaralaguj.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/1vvdl51c6obq4jatqshihm6ku0/powoxogopunilemuvig.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/mabubowuvivejijunoxo.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f9ca7c5c9---53197684362.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6abd769be---towelutotepomagexapanut.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/59077765626.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/df7e73993dbb51a98c72421c81c77fbe/2216690962.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/cf3ce937ead0336afe2701cfd5595ee2/fopozijiwesuri.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/30840405892.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/cb8d5cc0e3a9fc3df4441782beb17c12/zetix.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/krfb49fstrl5gpauuvisocaocc/vamova.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b512db331a1---tilekugopu.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/nanogefaso.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859f17ace3f---simupune.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202105260715192545.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/905a455ae10fe13b2c906cf14ab33c86/jonavuzuwem.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210523134811_250894561.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/392bc0f33a0b4330d356931e4ce099b4/88599532809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=definition+for+incandescentPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001e405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E405 4696 bytes
SHA-256: 51a247d1a82cf85a4291e3396c6306c817a96ce1ec8e1f92b28f8ff0235528be
font_02_sfnt_off0001f57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F57C 16688 bytes
SHA-256: def631129d74ba3e941f71aca1b89fbdc692fe4836f3107be9949a0d2597b3ca
font_03_sfnt_off00020d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20D56 23196 bytes
SHA-256: 08d8ae592d1847d63568ed3a3d065540d9d284e4bedc08125631b8c5979c0957
font_04_sfnt_off0002476b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2476B 10424 bytes
SHA-256: 75bb6410433102e31dd7d763139c6c3d8a977375b984ef8c57f633f7c53c1f8a

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