Malicious PDF — malware analysis report

Static analysis result for SHA-256 653d27a26d29528d…

MALICIOUS

PDF

90.8 KB Created: 2021-07-16 01:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a6a27cb92f264b29b3f81fcb773de279 SHA-1: fb20929062c7d0e86b32d42ff41245d41a51491e SHA-256: 653d27a26d29528db924609aecb4c4b061c02191b9b341ab3259b8e038f106f0
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=behavioral+questions+with+answers PDF link annotation
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/34955601a320bf2abc2a34599e56901f/jawotofefubovuwevoluxone.pdfIn PDF document text
    • http://texmet.pl/userimages/file/1128934281.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/61510531317.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/99225125136.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/460be47cab378f33d5891c09083836a5/65478778752.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/67376560a16cbb12565207487d78b5c0/xurelimisemexeduxegalil.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/26175479251.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/xiradeterukesixegoj.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/hh45o4c20pqc8l9qq77k1fihb0/68861751723.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a01062c25---sixamalatide.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b0ef21a41---50297598374.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///21155153415.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd56e44421---pefapawaritoreg.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/35u8apr5p6fbrmb4kvu72tgc21/rokamoluwe.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160df7e4eacc29---83985951278.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/momagul.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/v5ndb6q2s0sepj8t8kuq9qg43v/nuxowipujuludes.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608709d173152---38506520705.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e46712db4---nijiwapi.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/9bm3cm3vs5c1kcc7v7lkq07rkn/vulisajibupiri.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/lexufukim.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/tudix.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/wufekixunar.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_off00010287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10287 16572 bytes
SHA-256: e313e7637dcfcbb7808d0f5ac4b14855a7b7d4241d8f3bac4376c293116d4b43
font_01_sfnt_off00012d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14545 10656 bytes
SHA-256: 17cb4850ded6de18689a51f1bdd7ee453f74055ccfe8f8696184a39dc95a618a

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