Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f7742350b84708…

MALICIOUS

PDF

72.9 KB Created: 2021-09-03 13:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 23fb2d2aa4d40d110581e59eafe10cdb SHA-1: 6088c99b2048b34f9bc529953d97252ef9ad661d SHA-256: 61f7742350b84708d31fcedf5d7e136168a0b311f2b03c1b0d4c6f8c9056493d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the nature of the heuristics point towards an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chilegastronomia.cl/uploads/userfiles/files/66584050463.pdf In PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160785a6be0fa0---kexupumurapufisofo.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc982f2e7d---zuraritavuwizevasixokitis.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/46392736750.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/8047ea9e07f8be7d1fd630821eeaca10/53725081518.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/62491862152.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/libebapetubaxugewerug.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/viwos.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/7870273495.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d3bfefc2072---vidukibevejulelo.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160f131a7ac39c---gowox.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/autcupn9jo00qsf730vd41fo1a/92853616982.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/d54962f530ef5b059057b8fbd968f872/tupikugisoputuwegajader.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/32pj056a4tqso09i28gtappb5p/60651005900.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/39647268700.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/684660152.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/51585650576.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/7c7149bfecc4abd6f597c491eb23f362/47743722212.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/murat.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9648361bd099d412bea9e476906f1f12/toxodigumemomugowawubam.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/4b49c2fb0eb1eea7d5b2cc1895be4807/98339686082.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/43671667423.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1308cf0fc---67005450316.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/saxoxupaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=reflex+arc+worksheet+pdfPDF 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_off0000b8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CB 17748 bytes
SHA-256: 44bb3b5af5c7db5f6df3e5356237ddc3f0047b4390c9662155f41409c73c2584
font_02_sfnt_off0000fd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD02 10848 bytes
SHA-256: a9aa6748f72e747d9537f2a862ebb6b158ba36d61a4590e4bb45385a903365c1