Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff0ef2b9f103430…

MALICIOUS

PDF

91.5 KB Created: 2021-08-07 11:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6c623bdf2938d8fd23010929e79bff70 SHA-1: 3d191f855f4bdd5300d5c63612b9819c06a2259d SHA-256: 2ff0ef2b9f103430096ca2b5d30b607224e352b0975ff6e7747b99c7e7090c82
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of a 'ClickFix' heuristic suggests the document attempts to trick the user into executing commands, likely by presenting a deceptive download button. The numerous embedded URLs point to compromised websites and link farms, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=csgo+crashing+fix PDF link annotation
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1jq60prtp2dmst552glv9bg0p4/fabitilape.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea33149fa6---wakapofanedef.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/nuwujelitidofun.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/9d2aab8441b46f60fa88731039cb4b34/96027444831.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/8539750305.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/pujugi.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/xufat.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609633c176650---4585712956.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/sh1tn4mfdl4n4mmm4n9eq77vd7/13990163124.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/82108723984.pdfIn PDF document text
    • http://lakesideterracecondo.com/clients/41361/File/bosakiwekatiroxovizuv.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f481a237aa8---88757970040.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cfa4a1532---lerawerofusakono.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/kilonativujexosu.pdfIn PDF document text
    • http://flambotour.it/themes/userfiles//files/63562853955.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/7bfc730c5e1e5b1df393daaf15b382dc/bufipolitikofojelubulota.pdfIn PDF document text
    • https://hanomanberjaya.com/contents//files/69088019542.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a297d5a259---56957916312.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608196ff1b379---wamofopolitelenijezof.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/welaxozufesude.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd704a7d174---relijapuresumes.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/doridejupesemadegasokaril.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/pitivurixazinirezaxe.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_off0001020d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020D 17832 bytes
SHA-256: fd87f0fadb3490e4e143160e2dd33a315a4cc3ab32d27187c134eaa23c881fac
font_01_sfnt_off000130ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14916 10472 bytes
SHA-256: 68d5ba1a5dd12baada577c3be39748216d70457aa28affdbdfb83ae84dd23e6a