Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b03713a5097b0f…

MALICIOUS

PDF

88.3 KB Created: 2021-09-03 13:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d63e11ded2798b14f9d1d1daf16c4213 SHA-1: dbe6fe7112f84f63a9a8bc7dc8bc469737343254 SHA-256: 37b03713a5097b0f59de5b55fee896b6ad413d8ef94ad7512175275e95eb6fa0
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=toyota+prado+2015+user+manual+pdf PDF link annotation
    • https://mm-podium.ro/userfiles/file/98966258954.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160e30d4054d6f---ribomamigevuxod.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/73129393576.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/wuzawezubeseket.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/60031095473.pdfIn PDF document text
    • https://masihpt2.com/contents//files/79345910391.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fd0500fd4---todesov.pdfIn PDF document text
    • https://mattress-leader.com/media/katujatozud.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/87564684576.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb52aed3a0c---93138398007.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/9121099992.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fe36f7eecb6---saleregaguvomofipegu.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f21440c50b---bosubariwajabikalop.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/t6o13gg3skeaq1idjqlqdvjf97/65709250810.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/subalubiwugonufudexitagi.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f16f918997---bitefede.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/takofijomona.pdfIn PDF document text
    • http://irollee.com/userfiles/file/77058883705.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/3069c3a2b76f507988d27def3dfddacb/95803290681.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/kuzuvejujuvu.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fcdee7c52---80258196369.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/32375042857.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210718185500.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1628768700.pdfIn PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/41266562379.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_off0000eb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB75 11172 bytes
SHA-256: ba4fec710f18f0bf96f321eb295a7c09b943a8ff26d2da8e9c4ea0fc28154a50
font_01_sfnt_off000105c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C0 19540 bytes
SHA-256: 0237a91b26592727e996f062baa4d1a2c95820e4382d6de1dda0b8193d7c3b1b
font_02_sfnt_off00013989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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