Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f37bf339082953…

MALICIOUS

PDF

77.2 KB Created: 2021-09-05 08:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fa1372fad0924dcad5349150adba81b7 SHA-1: 27280812947e1d1256bc5e7e23ce9056d8aa092f SHA-256: f6f37bf33908295303dae696ff5dd3e0640e14edb793e0b9b1d41ed8da447230
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm for SEO manipulation or phishing. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the structure and URL patterns strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://swatimishra.in/uploaded_files/userfiles/files/faxaz.pdf In PDF document text
    • http://xinyuemu.net/assets/202108/files/20210826092141503343.pdfIn PDF document text
    • http://e-hematologica.com/users//file/23365801657.pdfIn PDF document text
    • http://bdn10.cz/files/file/nenejagevekawasebofuz.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/wivodobodazabexosefag.pdfIn PDF document text
    • https://cecprint.com/images/file/46343966656.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/30165019478.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/0khlopjjmeghn0514s3sfao95g/bewupakekalero.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/47278974423.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/09a04344878e00a458aa47703efc174f/xelefufesupaxurofewase.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a90c69f09f2---87979211759.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/c4rftf9lfaal46jecm11qj1as6/68451947093.pdfIn PDF document text
    • http://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/55271509097.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/mumuwirivajafasiri.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f608eed3e64---69943090903.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/zodutula.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/nurabe.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/27869435794.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/95794334548.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/139536de6aeeb9431dd0782cf60b457d/xuterapoxozosedoviv.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/28062901548.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851c5eda924---lakimivaviwazomep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=us+citizenship+test+pdf+without+answersPDF 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_off0000c6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 10924 bytes
SHA-256: 48091ef5ea98c6fa2096caa8dc6a8cded7b193b43545f50973a6ef3dfad0b426
font_02_sfnt_off0000f85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85A 18100 bytes
SHA-256: ee4d5538bf55ce37daf61028101919fffc18ccff06c65e6641c97708051f795a

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