Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38712c829465400…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 17:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a7324d3c11a815d038e65d1901df4270 SHA-1: c3decdd9ad0979fab24b0a7903d902bb99732b9e SHA-256: f38712c82946540083c3689eebc56274d78d59fd23b897daac6f2fed69691841
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of multiple external URI heuristics and link farm detections strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=low+heart+rate+with+afib PDF link annotation
    • https://digireg.ch/upload/3625436758.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/18426842462.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/95b19a3ee8de016861671f8a2a6a139e/86762353199.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/773f4f456ec2934a01a28f7237f7415e/59131196407.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/lorodotexuvafobu.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/96941194834.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/81168979604.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/7c5fbabd4291030d6c3f2a00b1be20db/92016209949.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/2gv3cp51uf2sbqqudtc7e66f8j/pifew.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d58fda3a9---71354195180.pdfIn PDF document text
    • http://tencanpowder.com/d/files/14329764075.pdfIn PDF document text
    • http://toyotarenta.net/FileData/ckfinder/files/20210807_D11660BB4C87DCB0.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/mikuwexi.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/14218445d096f7466e9d58ccc0cd8a33/zudogisepaxewevaweruv.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/2741381470.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775e7a33189---lomaxidupojizipegedoxud.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/dusaga.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/17252321982.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ad33a782f---mubekewo.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083eebc77177---kavapikerolesijuselizezaw.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/93737307335.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/3b97164e9c6fa9ee6dc5f6cc123658bb/zoposixa.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/duzuwikuvulebutibifonepu.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_off0000ddab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAB 10176 bytes
SHA-256: aa1ded27ea5726c42df5a172e2d030b9974bd47d6dc5507eece48ed08ab711ab
font_01_sfnt_off0000f4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB4 17252 bytes
SHA-256: 4ff87d4ca4a18131f849855f115a0c2a192f0442b364e8a692086ff7de86fb0b

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