Malicious PDF — malware analysis report

Static analysis result for SHA-256 0940e3d43991e6fb…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 04:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6cfcf8cf04dce027bfc1f93e7fa26a9e SHA-1: 2f7ddf5b50891d3ae3721fc5edce4aabb444c7d7 SHA-256: 0940e3d43991e6fb4e294224e6e2752a26397d89487f2f4f1563e64e7ee25419
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as phishing and containing a Trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous links, many with UTM parameters, suggests an attempt to drive traffic for malicious purposes, such as credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=giving+directions+vocabulary+list+pdf PDF link annotation
    • https://mimpiindah1.com/contents//files/vusuwopilafiguzoba.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/467055cb2fb88f17ed3dc227a3234256/88209984772.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/wedovivexilijipenojevev.pdfIn PDF document text
    • https://ienter.bg/files/dexejajosenilenozu.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160900e716a769---kinusomolowema.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e58c1b6a82---17732374776.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/jepav.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/kj44m2pd541l55rudphja1j8ir/12296835397.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/f10o1u9d3meos4lleocq4qt9n2/kedixanexetusujofuxato.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114f9667aba2---43193684535.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/77043801428.pdfIn PDF document text
    • http://jimigubellifoundation.org/clients/f/f9/f96c94eea877db95ad0a8b6fd709b1ed/File/34636503766.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9d1786bf4---mofurexuku.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/bodasolupakameluj.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/nusuwidaxeseg.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/0beqdo0i4r1ksq6d5h1bl9h1rp/zobadobogejole.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/zumimosinozesorukeno.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/1b1be409a961b2144951a09071f7d403/zuxujugav.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/56165727530.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/da68s0ghuttccnrc5o2t4dgb45/52929954449.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161211b765b6a3---57577518883.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b80022ba3cda064df5023b39fc8d8b75/movuwununasuxelit.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/biteveta.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/66377660441.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/28739718974.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_off0000e073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE073 17684 bytes
SHA-256: 3a685b52352f1731e55e786952dbe69ef4ae0e004e32af7fc5db5b5bbca36c3a
font_01_sfnt_off00010ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12604 11252 bytes
SHA-256: d6aac371b3288eaba7fb211e63ef396b56ab51e0ce4b0dc1f8bdc43630af4f29