Malicious PDF — malware analysis report

Static analysis result for SHA-256 e310fc19e361e8aa…

MALICIOUS

PDF

87.0 KB Created: 2021-08-12 08:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0ccc2a7d2b77abea6e869562af9d3b5a SHA-1: 43e988f436cfb58be3bf56ccf6331a73bbf90de1 SHA-256: e310fc19e361e8aa46d62b30ff64f822820a7bcd92d886f4c43ac7897aad5d0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites and serve as link farms. These links often point to other PDF files, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb2faeec88---46576678435.pdf In PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/63311874150.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/35943241684.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/61794738840.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160822ef72ca9f---69456871268.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16099bd03552ed---nivirudeki.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/35472777161.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/qnc3d0spmcpfnd01k1ffavc5qp/rabugumuzewigasude.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/80752071028.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/mutimelagasedijabawu.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/600805394ed19e44eef2cde1879b7580/62850172850.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/95862f7ff7cae61cd8116b267bc1d062/malixatopani.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/69950205709.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/f823fe4293eefead940b8e99310964bf/xuwajabidep.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/fizirufarapalujapi.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/20329877599.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/5d812e0a2b6307c53d639fc113a27f1e/88651930798.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607e087f2929e---49220755071.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/sifobexunenimog.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/najawubazibivo.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/bafuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=fast+and+furious+7+full+movie+bluray+free+download+in+tamilPDF 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_off0000ed0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0F 17256 bytes
SHA-256: fb3128feddcbd0c1455b0b4e1044dce9ff1328a0ff08701d6f01fa4f70e7eaaa
font_01_sfnt_off00011a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13225 11048 bytes
SHA-256: 6f6afb22e56d40da7eeefc10ed46ba2c449a9704ab7af5fd0ac5781ca2a49a5d

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