Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d622b4348c2599…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 23:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 10cfbd545f8a8fcfbc01b42856bcda29 SHA-1: 628002a42d43ac8b13edbad95cacbdadb26dcb88 SHA-256: 40d622b4348c259955805f7bb1692ea5574dbadcdddcf6cbb6ae205af3cfb940
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit users through deceptive links, likely leading to further malware downloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://interstyle.org/content/xuploadimages/file/93576320904.pdf In PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160d0315303459---zafowepukafewuvemijiredu.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/rilijuwodit.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/52eecb0bf24fdda86963a8a938eede40/buratulofunetatikipi.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161199aa7d9749---83127878230.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/fovotimiwax.pdfIn PDF document text
    • https://etimes.mn/uploads/files/perazudefubejisajomekego.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffc9ac7d32---1303352059.pdfIn PDF document text
    • https://area5srl.it/file/46845187556.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/50724671878.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/patilakalilufotopomatik.pdfIn PDF document text
    • https://designclarf.it/file/kuparoxuduzovaxepobube.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/3976049ee082f32925fcc60263034051/28829012246.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/divusinawopisaz.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/73869430546.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/70348683245.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb3ca894e8---27009669820.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/45768217174.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f01fff2a1e---lusetivolazibefomumujowe.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/mezifesetewiragelawogawex.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/fuxozamupazimugi.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/lijagukedopuki.pdfIn PDF document text
    • https://terrach.ch/file/zejiki.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/barafalakokoxoguwitunomiz.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/41181125531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=psicoterapia+pranica+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_off0000d423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD423 19128 bytes
SHA-256: 4cac6946a17cd91ff249ae34362cf1edbf85655a71939c8867e8bf1211fb12ba
font_01_sfnt_off000105ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EF 10568 bytes
SHA-256: e5ac71ff9e2ab60edd4416a6c3af19a9d2aa7815ab9792cc0f2d5a34ddd9d466
font_02_sfnt_off00011e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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