Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f92343193a1bed5…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 16:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bcdab330febec3f717cc8073c707dd3f SHA-1: e549d2c9337744abb311f7312afc9898d3e8be6f SHA-256: 6f92343193a1bed5a6aaf3333fdb3ef628ddb817d39ef4a6c828c866f1d161e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, forming a link farm. The presence of an embedded JavaScript stream suggests the document may attempt to execute malicious code or redirect the user to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://huntic.ru/uplcv?utm_term=call+of+duty+black+ops+3+zombies+apk PDF link annotation
    • http://dr-onesrl.com/userfiles/files/19462290231.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/marixikazaweriwatakesatuv.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/79070298629.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/40246275069.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/95218948506.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16131b6a9d2875---zufuvofudatalevoje.pdfIn PDF document text
    • http://www.depomatrial.com/file/56214953022.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131bcea0ea98---32933492569.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/5367779909.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/fisodozifogomopit.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/69a77e2202fc8e1e5f07ba4fcdbf977a/26939075116.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f4e8df119---79993423660.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/49285710062.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/30479332030.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/73886970192.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/95276021225.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/52124979448.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/22420080375.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313388c4e1a---sisamokutogisazikobadu.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210912070716921.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/75963563501.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/tufoxekuganejemado.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/gokuwikigewuvitesemabimif.pdfIn PDF document text
    • https://tdfstore.it/file/zafafiboge.pdfIn PDF document text
    • 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_off0000dcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C6 11284 bytes
SHA-256: 42011f7baa59358acaf6c611426a4cf7a63c9e1a8f5a638007b184a074f4ec06
font_02_sfnt_off00010f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F42 17320 bytes
SHA-256: 24195d986d50f3d222a7416eb5f72a235672ce048af450e5e0e3ca3f5fff4d22

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