Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fe9cbc266153b3b…

MALICIOUS

PDF

78.9 KB Created: 2021-09-21 02:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18ce723c5bbc1776807ca761befe62a8 SHA-1: 05d62b36b940387ed208f16a675838f5534ce433 SHA-256: 2fe9cbc266153b3b500287f79c87bda385cfb57792d917d281919ae0785b34f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farms points towards an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=how+to+access+advanced+settings+on+android PDF link annotation
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/d11edd18781c7bf467db21bc899aea61/kivapewezasalezebetalo.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/pejadaj.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/96311701228.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/sekejapezasosi.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/27307140613.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161459c438d5a8---33499447726.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/56870752774.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/49933748247.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/gibevuwij.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd4b8ef4c---89409535041.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/xejutuforejobut.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210912142308.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/82581902772.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/49934521230.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eedfeb1510---57480961475.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/patavinuzakuwamixawodeli.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/74901078986.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/waruzasujapor.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/ed6c1c1682884aa9b846123ab9ca604e/firogezew.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_off0000d1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DB 10644 bytes
SHA-256: c2125855962531f470fe341533234b1676875cd54e00ce803a30e6c75bbed4ad
font_01_sfnt_off0000ea2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2C 17180 bytes
SHA-256: 1badd3210b35771a1daeb7e4a8500b48e277c4e9f1813ca0b8ff2317088a7bab
font_02_sfnt_off000115f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1