Malicious PDF — malware analysis report

Static analysis result for SHA-256 7795af605c943d58…

MALICIOUS

PDF

70.9 KB Created: 2021-09-05 19:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a83f511e8551e046ca12037d221f3b4f SHA-1: ae917309466f33a8d070300ffc4d3db86272f8da SHA-256: 7795af605c943d5889505ec14d4a5e056a18fb6af815507a08e3ca03c63bc748
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which are part of link farms hosted on disposable domains or compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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=area+of+shaded+region+of+a+circle+worksheet PDF link annotation
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/63163433242.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/wesot.pdfIn PDF document text
    • https://mtcmultipack.com/uploads/files/vudefunilosa.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/vitelubejukogofemobozape.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/f70c2b3ba6807ccd6ecbd0280e96ba38/60303402601.pdfIn PDF document text
    • https://ms01bet.net/contents/files/34346097656.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/goduvem.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/siwal.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/xedumezigerivimaj.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/80079517084.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/68123770303.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/d341cc55e8ab12b40c507222a7d8b7e4/90074142181.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/gu2bunbi8gopvpn1oncda86k9c/50769758063.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/3lck24uosql8esdgo496d5j90d/29965166692.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/rupefonagowunawupiweb.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071d7e0299c9---75150973462.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/rugibonitinavifaviweziba.pdfIn PDF document text
    • http://countryroadssiberianhuskies.com/clients/e/e1/e1b2222506e4b6fd6c510396e08362d3/File/nimizijedavo.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/96580895038.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/borovolob.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/a614a832b87b800df703f4ec49b6e669/piviwik.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/kivozo.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/216040424b683e6bef680bf8e3f54112/29608174357.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///monipodojominipigajudar.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/f89378759da59f813b83fff5b5a8962f/88660549092.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_off0000b346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB346 10912 bytes
SHA-256: cdeb1924edc651867d077821293c28978a5e0a274c6850f58a1ac3b3c4a5e057
font_01_sfnt_off0000cc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5A 16016 bytes
SHA-256: bf61b2a48e5be8b55f733263935db55ece5e9615f7ec246fae17157e3ca66cb5
font_02_sfnt_off0000f5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1