Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7812bc4afe9a90…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 05:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 880b0be69eb068bf3bc81123b3dc4d1c SHA-1: 10ff8455134b8badc87b9b0b336967cc04447d49 SHA-256: bc7812bc4afe9a909ce1266786dd92d8daf7c28d8e0b86d5d189d9b7a8227840
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs are consistent with attempts to redirect users to malicious content.

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://medvor.ru/uplcv?utm_term=worksheets+for+adults+learning+spanish PDF link annotation
    • http://litho-and-co.fr/ckeditor/upload/files/poboxikawavisud.pdfIn PDF document text
    • http://scpt.it/userfiles/files/25938129895.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/97603843578.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/fijizanuwafevoz.pdfIn PDF document text
    • https://techlan.pl/files/file/92613889153.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/7a5cca9520f7f0971fa04dd6f9ec470e/97783172212.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c300cbc7a36---zutivodowisodolufin.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/g6vc2bh55ocpvojam8huiah81j/70402473666.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/59696900372.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/64645045410.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/b9115c21ae9279990154823c73ca9cc8/59148982014.pdfIn PDF document text
    • https://aksusu.com/upload/files/34795872402.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210731071615_2mvk0s.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/21863e3c2d38540139e2bb95887660d2/tibugowil.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/08771dacb0e58f8fe6b2256a3965c567/dudaboripetagofabi.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/9p6e4abnph5q0311fcfmhvee8k/zogezamuvixumofuxakuxik.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210720_8162311CBB546017.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/kifapo.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/karedabesuvaxew.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/lisise.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/posi51dbrvf4javlth1herpd9e/58226877634.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/fc6tcc9o6t2r8v9qq8spqb8pi6/jeruturutobope.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161236f5081cbf---minatoronenazez.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/damasepevoluvome.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_off0000dfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 18072 bytes
SHA-256: e621c8b7fb47cb19b9e68d134ca8fb2be434bd541e1229bd35bbd920bfcccfe2
font_02_sfnt_off0001261b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261B 10960 bytes
SHA-256: a244794e757373acc9a6e2461b50ea1265663454dbeb7cdf89beb516aa77960b

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