Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d82e2e932f6422…

MALICIOUS

PDF

74.0 KB Created: 2021-09-04 22:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e390e9307c73a5ec3c8e56dcb9646b73 SHA-1: 0630fec5e9802874acff51f5e9f41fa2b6f9c51a SHA-256: f3d82e2e932f64227aaac86a6e5059765e6e6e281b5e74c15d7feb0534e30deb
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://xistenze.nagydavid.com/files/files/kosowuroduponax.pdf In PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/he1tgi4e89agk39ql04ejjv7jk/27431236692.pdfIn PDF document text
    • https://polandpools.com/contents//files/nageferadovawosudobajateb.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fbda56d37---94103458648.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aec018d0eb---wometujo.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/7657200301.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/watisozewezefile.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/naxuvozenirikimazusu.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/56225775970.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/15990637120.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/57879173008.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/titirunavodenagevotozif.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/n0tdu3vjnsbnfvdsmajrbampag/gutekewivuzakotunoma.pdfIn PDF document text
    • http://mopron.ru/upload/files/83003878927.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/84542385069.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/69f3af7254f9e8103b66278f0f081a19/63793748131.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/tasonodirobuxerimosutix.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbd675fe54---fifoxinizosun.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/il1kaivckr1cvgd621u4gv814f/sizizinowe.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607000e40e34f---9876520055.pdfIn PDF document text
    • http://furniture83.com/upload/files/nokejoroguseb.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/teketenet.pdfIn PDF document text
    • http://e-district.org/userfiles/file/zejiw.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/ramanipedikasexeju.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/2a0737b5b83dfbd525cd3f0163ee8be1/tixojeduteki.pdfIn PDF document text
    • http://4yoga.by/pics/files/14833352808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=images+to+pdf+file+converter+free+downloadPDF 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_off0000bf0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0A 16040 bytes
SHA-256: 054b0aead6da1d6ea1408a8f5107b2aca7fb022bf7339c8b9daaba814fe24063
font_01_sfnt_off0000e813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE813 11068 bytes
SHA-256: 6f344b2bd549dd5228324a969afabed0ce7c373f84418aa322402a876338c19c
font_02_sfnt_off000101ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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