Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7395203c6024a9d…

MALICIOUS

PDF

81.1 KB Created: 2021-06-26 19:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ec82a02c8687fc88f6164e9462a5bb3a SHA-1: 3570826ea8a3e90e33f7f59182c425fdeb27d6db SHA-256: c7395203c6024a9d91ba0266dce9b9459f9e4ea48bb164c9285de0cd7b423401
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites and disposable hosting, indicative of a link farm used for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, but the structure and URL patterns point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://xn--2vxr09c6mc.tw/CKEdit/upload/files/52847650718.pdf In PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/aae62d2f4abe886389f75adfce606f89/pasol.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/6e9e7d3e23e688694687e76afecddfa4/levodukavubiz.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/rosifaxogejite.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///95404144934.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/75178244782.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc0e509a87---32344278132.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac49a50452---10354721193.pdfIn PDF document text
    • https://hirurgija.me//files/66112596894.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/57877bdd754cffd82f733abd2a9b1d14/16315248970.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160907ec209df1---38466951906.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160717efab510c---89259062734.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a7449029357---62824017574.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160724771a5a2e---mizovelokosukilirejis.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cbcee4830---mokibogujovo.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/9764eb25381cf85481c1c415c07519f9/kosaleledosunaruv.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608af30c17cf4---balimozonaninifi.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7720e4e06---wiranalobimigikutive.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b65052cbdc7---42816287197.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/91729835858.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/0be9ac8ed596d1c423f63450901b1835/warixupowimegosa.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/golinagodidufefiwi.pdfIn PDF document text
    • http://dzbnf.com/upload/file///14474569627.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b99c55c834---xerirotujokazumigakudes.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/4clullh85s2en6p0okga6bb28b/3296160808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=rational+and+radical+expressions+worksheetPDF 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_off0000da31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA31 16588 bytes
SHA-256: 5fd5b89297f4de52d5badc4beaedac215542a419898b67028f85bd6c19a9d6b6
font_01_sfnt_off00010567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10567 10936 bytes
SHA-256: 72763f08a81755344a2f44bc8138663406f33f6aacc254c4ce3b3592bd24f0f6
font_02_sfnt_off00011ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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