Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e0c24227dde7b4c…

MALICIOUS

PDF

93.8 KB Created: 2021-09-01 12:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3f4c281e2fdecd8440ec609a5f3c8cfd SHA-1: 579f9cc965502fe9b1ab72d8f9968d5b23e6dcd7 SHA-256: 6e0c24227dde7b4c7d2da4f699bf8a4d8abae0174cbb06e1164540a6ccafecb0
236 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, specifically identifying it as a phishing or trojan. The document body, though heavily obfuscated, contains lures related to recovery secrets or private keys, indicating a phishing attempt. Numerous embedded URLs point to potentially compromised sites or link farms, suggesting a mechanism for delivering further malicious content or redirecting users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ewt.cz/res/file/nimunedadewasibesabego.pdf In PDF document text
    • http://indago-rovigo.it/userfiles/files/8066684212.pdfIn PDF document text
    • http://paliukenas.lt/i/File/vetejibow.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/kaxovoxubadu.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/mivesuditiketerakifu.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/60715062257.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/bcbhaajggbhvl5j4d6v2qtb27c/16127839572.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/68843664714.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ccef7f282---16622999638.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/barodufukobeko.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///pimubuxosejata.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/fewakirosu.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/pebedapun.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/b0419d81870bf51ca05324aefc8b74b8/nipatusunalixegow.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/dinimopiwogiwusiwikobon.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/2d23a04427eff0c11bcdb3adc7a20298/wiwanurefatijirusofuf.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/muvisol.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d7ebb6f04d23a29ed9f670b53708daba/potidu.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/024o2n8pejthlk8hmt33eb79s3/40504304218.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/kojapazenitesemopo.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/pujexutisuzixej.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ota7330tto7331m41k5eiv1vo5/zusuzupijipowe.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/paledakijilokitox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=thin+client+network+advantages+and+disadvantagesPDF 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_off00010b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12395 10856 bytes
SHA-256: 395f8ce3f30a6e4bbc11f554ea5c27ba8f22a4cf32e6ec8d82a8f43e37c68a6c
font_02_sfnt_off00013c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C72 17168 bytes
SHA-256: 85b956ee3ae5798745e6b1d27894a60e7ae7df38aa4da9c1c6e0a0a1af39030d

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