Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe4066fa8cfe18a…

MALICIOUS

PDF

90.4 KB Created: 2021-09-05 22:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ca242118d90f0adf7c8f47f27d71d6f9 SHA-1: 3822818aca43a3dece49e9883842f44c181c0659 SHA-256: dbe4066fa8cfe18af6992b33817c5368aabef6cfbed6ece4b37080a40f367f64
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, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites. The primary purpose appears to be directing users to potentially malicious content through a chain of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://oniceh.ru/uplcv?utm_term=higher+engineering+mathematics+by+bv+ramana+pdf PDF link annotation
    • http://babyindex.nl/images/uploads/zafaga.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/zofumirosalulegejuxopa.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/wivuwawuzavinowolezobolet.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6ee81ec9d---37073382489.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/126b506f5c5f4624b413b176bf31c504/85907145826.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/28948194135.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/sopetewetakupabaxebiw.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/863591b0b081461fac2f8573c4f50091/xowenufemobufuvala.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/87786732178.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/wawugozi.pdfIn PDF document text
    • https://12waktu.com/contents//files/36489655410.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/65d95ae504f9ddf8af8ebadcda55e0e7/pewejegorezimasubi.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/32963902053.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072735149291---147417455.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/surika.pdfIn PDF document text
    • https://harom.ro/files/file/8733566938.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/78719362922.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/1e04840c3b8401bfd98a591784d1f118/samiwaremaluwavivexusu.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/faruridivati.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/16286117885.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/59900286224.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/3142327db16125bd8a0a61b4cd7f926e/2591466262.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/0805dc58c9d2f591593bfdaac711587a/46689282793.pdfIn PDF document text
    • 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_off0000f743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF743 19488 bytes
SHA-256: 6221632556d75f952f30a279569ec95ad11f6cb5775694c02eba562979c24454
font_01_sfnt_off00012a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2B 11212 bytes
SHA-256: 394d0ea89aebc27371839292a78901342c02a66a953697c77c17387dd097cb37
font_02_sfnt_off000143d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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