Malicious PDF — malware analysis report

Static analysis result for SHA-256 b899448e072ac26e…

MALICIOUS

PDF

83.2 KB Created: 2021-06-27 05:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38303100e46632e362c042b9195e3305 SHA-1: 2694cf0fa55e7f7297f240ea2bf3f66c74f31ca9 SHA-256: b899448e072ac26e1642e256d4e96ccb472402e2ad1f03d770598946b3d43902
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. Heuristics indicate this is a link farm, a common technique for distributing malware or conducting phishing. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest an attempt to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://gyobel.itpublic/file/vipafeposelip.pdf
    • http://lapenya.cat/imgjovesnaves/file/semonidalaj.pdf
    • http://trungtinjsc.vn/upload/FCK/file/5053449944.pdf
    • https://dm288.rs/slicice/file/jeputuwakatefuzeke.pdf
    • https://kozhikodedeaf.org/admin/my_files/file/28609346467.pdf
    • http://alarcon-v.com/editor_upload_image/file/solalapulebo.pdf
    • http://artgraf24.pl/userfiles/file/4169586195.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/0505cc7caa6434cce829a6f5dd9b1961/63887920971.pdf
    • http://csc-020.com/userfiles/file/20210613202502_1rifry.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/5vt15a06lngf2qjeec41lkmchn/losusukezitawikugo.pdf
    • http://bajajsports.com/userfiles/file/5736778239.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c966451a3a9---76070801089.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf26c7c659---90826209600.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/8b7sh03quh2ukrff2qvhc4cd04/18071951507.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086346de3cba---bilozaluwidedozeledewedu.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608f031dead53---91592673293.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d59c8868e---87737508034.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/hqdmjgbsimkhadjvme6rpr3eik/94199317260.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/6qjvbhf0lnerntorheju8h7can/29168790069.pdf
    • http://hytechplus.com/userfiles/file/nuxutomenavovuvavivezu.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160be6e324c2d5---77843522365.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608267fd559cd---pebidewu.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/j9ft5ooif2p4vr2ksvbk6bhol1/73677472640.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082bd6108d12---20046384812.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c77ec02d93---30257613401.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/0kdfdnnou1hna8q0pbq88dqu34/tagovumixuvelido.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=autoclave+cleaning+instructions
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2d3.bin
1374ca129fc84abc1fd77d9f6f84b67eaec3c9511c6de813db969a4710811c9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D3 17064 bytes
font_01_sfnt_off00010f3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3E 16792 bytes
font_02_sfnt_off00012755.bin
bf356c6f68fe44bf8312d5f1558b117c1df5791054d2b5c6ac4b3a86f2b6c8c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12755 10552 bytes