Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe0f86edf63a1923…

MALICIOUS

PDF

75.4 KB Created: 2021-06-19 02:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf047eadc73d3a7eff2db08b463a10b6 SHA-1: ca1736afff34abcc052152c533d7913a256f8644 SHA-256: fe0f86edf63a1923a9ff1b1895d12aec0d0ffc0035a358854c59ee7a04c4788b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various websites, some of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=mom+and+son+xxx+story
    • http://caf-ljubljana.si/docs/73262058879.pdf
    • https://boucherienabli.com/uploads/FCK_files/file/nelarupakibimipepod.pdf
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/44624657014.pdf
    • http://mwflower.com/upimagesfile/%5C/pokete.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdc3fb9c31---mimigosoxodisovu.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072ddc99057a---xojasifozeneru.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/88a7df63e82f31f3f4f304717728b353/padorok.pdf
    • http://fields-on-earth.com/fudivawal.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5318b3a52---xezolepakaxekovubewabun.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/12d7f0fafa24e11ffb0a1f839647f545/jetodopeguvubesedez.pdf
    • http://perfekttorun.pl/pliki/56136948270.pdf
    • http://alexlunacoach.com/img/editor/file/21360809887.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfe609b591---fonenebavonalovobonamogej.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897e45009f5---6277814929.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead7.bin
235e64d8b7ee2fd691630ab0e8c958b656e63c8905896defe122a02d10bafdca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 5112 bytes
font_01_sfnt_off0000fc39.bin
7ffdf2b6b6588ea99db551fc9cf7999448cdcf2e829e5133a38c93cc21d2530c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC39 10640 bytes

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