Malicious PDF — malware analysis report

Static analysis result for SHA-256 3358065c915b3846…

MALICIOUS

PDF

92.3 KB Created: 2021-08-03 00:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b3c200fde2c2ffaab55eaf6dc7ef85ad SHA-1: 713d84c1c4237e5fe7114c373b413897c6bfa0dd SHA-256: 3358065c915b38465c22b32e9328816d85ca53d001e79d7802feb803463649e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads or disposable hosting. The presence of embedded JavaScript and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest malicious intent, likely to trick users into downloading further malware. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.rotudavid.com/ckfinder/userfiles/files/73124767828.pdf In PDF document text
    • http://moiarchitekci.pl/pliki/file/60533856807.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210503193128485.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d15e99c05f---43703826057.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/tesulenire.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d078c50554d---kiriwutumuneg.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/duzufibemuviw.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef6f0ab375---fezezimozebajusaruj.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/83508527325.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/lirezazap.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609298fd4e399---kalerogilatutixox.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/kuxowatinuxekapovof.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/37805503018.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/463ae8e1c6c6f8bd40b54afd8f4ce476/xatoferanosunaverafefaj.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/18c31bd4f23ce833591f28e72057e205/30812322079.pdfIn PDF document text
    • https://rotherelectric.com/files/vewole.pdfIn PDF document text
    • https://bdata.vn/upload/files/13924814309.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/sajikigekerurir.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836eca7f319---36350536998.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/59c6a25f1d03bd262fd5107cdf1b8d0a/66674686679.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/tigawebidun.pdfIn PDF document text
    • http://rideco.hu/upload/file/pasukamejabedaniluka.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/xurasanoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=descargar+gta+san+andreas+con+mods+incluidos+2019+para+androidPDF 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://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_off0000fd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD99 18596 bytes
SHA-256: 17fcdd5a635aecf7d2f8a08455a5677775e53f560b56e392657ea9a6b070c552
font_01_sfnt_off00012d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14574 11420 bytes
SHA-256: 0bac63505e74ec719d5ca890ad9f5807f2575dcf7c2bf2c7d780d7a21443bb49