Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c25b65063c8c81…

MALICIOUS

PDF

78.2 KB Created: 2021-07-18 02:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 70aa925ebcc962fb30ba980949dd8dbd SHA-1: 67efbee56a9b28237f4415813f38f7987f7a8d52 SHA-256: 87c25b65063c8c81a5543207c3a723265f06c594474b202cd2754b56f6a153a3
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous PDF files hosted on compromised CMS uploads and disposable domains. This structure is indicative of a phishing or malware distribution campaign, likely intended to lure users into downloading further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://eobliecky.sk/userfiles/file/debodajigikonojumot.pdf In PDF document text
    • http://sumterhigh89.com/clients/863574/File/60832332704.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/50510861243.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160747d12d70b5---29942360344.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/53428230211.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/270b5d55729815a41e102f25518ab68b/tizaxozone.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/t077ob0kl9sqb5hqqo0938spe4/34660938926.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/kokonederedegatifagulo.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/fc29606874adb3d30d3a7c0b47ca3dd6/mipupunubowevafefulirav.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/wokexazizoporawo.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/34855350293.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/befunivuwa.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ba0b87844d0abbb937d65f50ebda697d/divegotitu.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/59588518649.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/nadomupesemenabubekibuka.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/66325188082.pdfIn PDF document text
    • https://rosycaffe.com/file/xaluwimubevafupopinifaja.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609347a841a69---fesawibovedub.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/fuvubopata.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160790d9ed49ea---xerafavufona.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/kikilojejasefewovemiga.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/4ld2o789t5mj9euqjlascm2id5/nomuwadakakodixodupiropof.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d74d1e12fa0---vulete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=peter+godfrey+smith+theory+and+reality+pdfPDF 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_off0000cf78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF78 16496 bytes
SHA-256: 7673567b7407edee5ac2bf9b65f0162232f52444a0308b3a923560e92073b423
font_01_sfnt_off0000fa70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11287 11060 bytes
SHA-256: 8057f15a1e06992b05be06e7926cf5a9ef1ce7efdb2c1fb6fcf6b9220c8dca28

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