Malicious PDF — malware analysis report

Static analysis result for SHA-256 f412a024b6275be1…

MALICIOUS

PDF

83.0 KB Created: 2021-09-07 13:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 509ee17cb2bcd6e6338760e46bcfb619 SHA-1: 5cd9eb906b634e85b327c1621af7b83bc3bc9235 SHA-256: f412a024b6275be10c4482f7bf8d439c929d23ed7f34f3d463ed9b09785cfa2f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many hosted on compromised CMS upload directories, suggesting an attempt to obscure the true destination. The presence of multiple links and the use of a link farm pattern indicate a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://argumentua.com/i/file/zafavuwipi.pdf In PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/454c9fc35b1216107a26bb4b9a480307/73661617269.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/57ed0a93258fa6e57c046962b3657a3f/mojixunuraxeviwexilezedav.pdfIn PDF document text
    • https://wildnaturetravel.com/File/11465245564.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/bixisozisorazugilura.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/surorofilomomuxilogitoka.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/6633603239.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/362arfuosuq6fveb4puktddba7/30073327109.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a01c84b49---99812043488.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/b2092pskvtkm03tg1tnptpeo39/16640854520.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/u62g0gab2l6nvq3461gtedjp2n/dapiwafumebibufemur.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/kuduguronomuxodaparaviso.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/56652057367.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081c61b27e6c---nazorukarobijubefatokalas.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/81224604026.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/99714896120.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/duludu.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/80516709804.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/22291408515.pdfIn PDF document text
    • http://keacg.com/upload/files/78396683715.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/tegojejanuxovidikin.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/84747818191.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/kamunowi.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/11529604184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=abbyy+pdf+creator+free+downloadPDF 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_off0000dec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC3 10672 bytes
SHA-256: c9b59f672fb03f313868e7d4f28f06ea39f98fa72e335c3312d100c41aa24ee0
font_01_sfnt_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4A 17956 bytes
SHA-256: 756e5a57a69defd776ca67ed6a66767d3dd3eee74aa354ea962ba67693cecd4d

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