Malicious PDF — malware analysis report

Static analysis result for SHA-256 3968620d21cc0e6c…

MALICIOUS

PDF

68.5 KB Created: 2021-10-01 11:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 28d1e41bb8269957883a8bbc3a4d863c SHA-1: f0add876f002e62f64ac0173d7ce4f5a01dc8a3d SHA-256: 3968620d21cc0e6c3c3ede3c9d75aef2a65dee4254f600e66dc8d79756c8ff27
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The heuristics indicate it's an image-only document designed to trick users into clicking embedded links, which are numerous and point to various domains, some appearing to be compromised WordPress sites. The primary link, 'https://chcial.ru/uplcv?utm_term=gtv+live+cricket+score', suggests a lure related to live cricket scores, likely to entice clicks for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://chcial.ru/uplcv?utm_term=gtv+live+cricket+score PDF link annotation
    • http://www.cavice.fi/tiedostot/files/14988431191.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16153b7f7569be---puvufafitabug.pdfIn PDF document text
    • https://agros.net/uploads/file/52824088985.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/64835204098.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/detam.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/jopivunafiwevokipimubenu.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/kekidojizezofoxebogas.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a387e57963---putukomu.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/91430478152.pdfIn PDF document text
    • http://www.pvvc.cz/files/sukaz.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f633875251---pudogila.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/36356919387.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/41508285917.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/86554443484.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/35712671007.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/6738726461401d901fcdd.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/9d54ae876192a9b817e56aefe8ab061a/jetalobefafovalelizujoxi.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/nanewirojopawud.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/dac894d3ac5170173a7ca0c0b10d57d8/zonun.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364b442e59f---vozobizegonurexisu.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/zalomamipimo.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/41986432298.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/gikitujitemusuxoxanaxiw.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_off0000af7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7E 14608 bytes
SHA-256: 00d1d3be5466630d81fac930d95a0e67d4dc9738884f9650b8a0f03cb11b2eb1
font_01_sfnt_off0000d43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC53 10152 bytes
SHA-256: 5fe0d5d37191b89915e755a26986034b36a2c29f8fa69ddf5d679afdff8fe184

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