Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf638fb8587b366…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 19:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a7d79ea283ea9eed4fa9b1b07c463bbe SHA-1: 9fe345bc0e9166d4ca74d2dd9d78d4b398776b12 SHA-256: abf638fb8587b366877622f2f9f1e4f0070e038942558e6350e3e29d661c1a70
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://emaaravm.net/upload/files/doselasegeleza.pdf In PDF document text
    • http://hvpeds.com/upload/contents/file/vukeluja.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d17611e14b---10191486602.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/bugelowewowopusipipa.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/sbo40beqg3nor07eskholi9lk6/89568249168.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/6149128791024.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd87eb8fe1---fejibalepibimodemeboxa.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/negosokiw.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/cfed6c336a49df9e403c7081f5d08310/81071210268.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614e95149abfa---18233632272.pdfIn PDF document text
    • http://minhanh.com/files/nujuwenisemijigexite.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/nomemisage.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/sisef.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/seduvezu.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/towawakavaxexoxumuja.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/gelidufoxekejabixivigujef.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0287af800---20789591651.pdfIn PDF document text
    • http://kccmaul.com/files/files/lulebora.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/teveto.pdfIn PDF document text
    • http://tencanpowder.com/d/files/lozitamimi.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139cffe8e7c7---37898801560.pdfIn PDF document text
    • http://doanhnhangiaophanvinh.com/images/files/dudesujeretapuvanedidised.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/bedopegira.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/om3nkkqbu04uqb3mt8eokvvc4r/vevalojogotuvupapepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=subway+surfers+hack+game+unlimited+coins+and+keysPDF 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://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_off0000b357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB357 14472 bytes
SHA-256: 69f3c0349e3fdb78ff3efe8c40131fcaad8920ee4a724428d69ca8fad5b9a7ac
font_01_sfnt_off0000d75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75A 11528 bytes
SHA-256: 298620f2a72acd34043ddc043c0ff130af8364a1837e5cfa9b70f7299ac4d2ca
font_02_sfnt_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1