Malicious PDF — malware analysis report

Static analysis result for SHA-256 795fb13bfc649493…

MALICIOUS

PDF

108.7 KB Created: 2021-09-07 20:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1d76d3d38fb818a5638cfd869a6cffea SHA-1: 55c428f110066f445578e5e4fd085ff2e2255df9 SHA-256: 795fb13bfc6494935992683650e195d18d2d8f292cf06039c210a1000b1241b5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised websites. The primary purpose appears to be directing users to potentially malicious content on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://vipforiraq.com/userfiles/files/60533063782.pdf In PDF document text
    • http://duef.ru/public/file/wudetewo.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/4g0j1euhbs9fvlerm6tlpstc68/47950342128.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/vajubefe.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf8c6e85b8---letedigovedesilorefexev.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/luvarorozizalowikukalo.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/wurobizokosifazuvefit.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba3c227054---85527599293.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/9cce969e48bfe1f72ee6e26eb71f9a68/15871467022.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/71124458170.pdfIn PDF document text
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/55041899479.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f5d9b8672---4148537218.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4e57ec6c0---91133237701.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a7b33ecb1---sadatipanutumovon.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/6b96fc61ad8b42aedddd85428a23390b/75742984871.pdfIn PDF document text
    • http://dothi.info/images/files/73467271175.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/hk28tt1jg0n1glo82trnfi6fs1/boxiraziragogilofovosopov.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/69467998294.pdfIn PDF document text
    • http://lawngo.net/fckfiles/zawojevale.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8d395acd4---65405781584.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/b9f41fa7cbda55382783398ccc8bb71d/gupobufisawasibikotoma.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/53280788100.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/molanokej.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/722cf2e4dcd32dcdba3da18e482e315e/66848551638.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cambridge+english+language+assessment+test+pdfPDF 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_off0001406f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1406F 11096 bytes
SHA-256: 18516129ac0b4cb92abe84b598aa2fe11b2b439baddd383b5de75c002fbd9c5a
font_01_sfnt_off0001599f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1599F 19304 bytes
SHA-256: 415ee1ec535e8a49368dde710ebc63b4da9562f27dda9ed85a771f00d77af78e
font_02_sfnt_off00018c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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