Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3869d4bc2c1d42…

MALICIOUS

PDF

84.6 KB Created: 2021-06-27 23:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10d90ae2999dc7ee7d9eef6f25a6686b SHA-1: e7cf54a4110e70fd46b49551b68c877faa66d207 SHA-256: 7b3869d4bc2c1d42200c902cb555305b5d6bca84ab0261aacc45be7b9db4a62a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. Heuristics indicate this is a link farm designed to redirect users, with ClamAV identifying it as a phishing trojan. The ML classifier also strongly flagged the PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=breastfeeding+during+hiccups
    • http://vorne-sitzen.eu/pcms/content/file/tapumoveven.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/hsihe4ldqcujifs09g5jj63i8d/61130829001.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a52e61cac5---neletosijegekemo.pdf
    • http://sivam.pl/files/file/2850175433.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e01a8582f---wezopatodofi.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/46b499203e072fc06f93e463ef7b9da8/24158839509.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/20764180057.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7b0f1616b---fudemar.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5a3142b4b---fefibixedazovopopetu.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a46e15e0e3---67807142803.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087402770c07---doxagi.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pp8jj1vauucp0hf81pqdr8ob44/pazazavemiwugaba.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cc6e86074---10967199724.pdf
    • http://webinaris.net/ckfinder/userfiles/publics/files/75957566363.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16083c328e5fb5---44344804153.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/vmjsbtgdavkus8qb26nip1bjlg/55144367404.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/58641795201.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/5e93cd8ce00c879c8aeb1967ac48e512/80184047349.pdf
    • http://urparitet.ru/admin/ckfinder/userfiles/files/92145064270.pdf
    • http://kemmurad.com/webroot/img/files/gokadiwiw.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9072260996---lokididurofilapef.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa4227e843---tugevazum.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/towab.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7729500220---65934011617.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/1ed346beaaba4e7631b5974c02e2c948/kefidinij.pdf
    • 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_off0000e7e2.bin
09f62d5dc8168f6fcd8a40ff2ed9f639a63c96199212019a0560df2316a2da02
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E2 10884 bytes
font_01_sfnt_off000100d3.bin
876b6746b685430a2ccc44c5bb364d0a7915e00af2f572c04a57387ad2c42570
pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 16368 bytes
font_02_sfnt_off00012b57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B57 16792 bytes