Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac91f89cd885bb8c…

MALICIOUS

PDF

88.5 KB Created: 2021-09-01 17:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b9ee1c66920208c9476281040141fc95 SHA-1: 98dee78111c6775df1d8e1d03d0f1b50e61feea0 SHA-256: ac91f89cd885bb8c2597790fe4249885a60d4c9220134246416528d831d100d0
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised WordPress upload storage and disposable hosting sites. The primary function appears to be redirecting users to phishing or malicious content, leveraging a network of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://allytemp.ru/uplcv?utm_term=drive+right+book+answers PDF link annotation
    • https://ptogel2.com/contents//files/nusadozuxewu.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/38861389053.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607186a621a0f---renibinivapasidatuk.pdfIn PDF document text
    • https://rjpexport.com/files/37845413889.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/8145b2cc22d554db347b075b00d9d00f/pomaxewonezulilawe.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/22017942829.pdfIn PDF document text
    • http://edgecs.net/documents/tolimefunijitagojetixuj.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/4536361355.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/radaluwixinenof.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/22u8j9oasqcqrb38ha4hsuuum4/lafazepilonorubis.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/079db8d88d283a5bc5bdb7ade2dcc613/649133997.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612257c174228---53399434739.pdfIn PDF document text
    • http://www.heksan.com.pl/file/zitegotulivavilugeb.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/41965936962ec52f28cae5ebd6406f76/54347487986.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/46484315725.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/xawugurudopijumawag.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd192d3d898---vovutumorodopasixolofe.pdfIn PDF document text
    • https://asiabiru.com/contents//files/keziju.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/80491101337.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1510b36ce---zegoba.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085f09f35dc8---zelesimewotevi.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/suzuruxunefefi.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb1a96fe3e---rodatisuzonugedoro.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/55fc2b05885d405ab6dd2bbba4970e15/21710402187.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_off0000f294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAB 10724 bytes
SHA-256: 5d259ddf67953aca466d8328ff596a6214e5dce7e1b41950dc74c6194e9985fa
font_02_sfnt_off00012356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12356 18532 bytes
SHA-256: 685b615d7b48f8f693af60e9e2b5f966e05ba0932b1e8feaef51a2f45dc33a12

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