Malicious PDF — malware analysis report

Static analysis result for SHA-256 52843a95914661de…

MALICIOUS

PDF

85.8 KB Created: 2021-06-30 03:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2118fb8cbf49b77d81bbc6e85a753961 SHA-1: dd390c3f012963d4aa502618bbd22d06a61efdf1 SHA-256: 52843a95914661def26d46815ffe8920cdd3f6b20da234f0eb003ed9a41bfc55
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://agermag.ro/mm/file/60260348657.pdf In PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/3ef6ca8cfd96620e4ea6d4e84f83ab01/87849373786.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/c2gh2vknirbleph1somfvj5fs1/lepolopefumumejomis.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/069488b38bb763c9d2fc771ab9333227/90752547401.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b91da4fa08---27845177348.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc69cbe1d4---80592639040.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/82535948420.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/eiogn8doh5ubea20u11tehjuc4/54755432910.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/kaxulifilututu.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081253d4de6e---kemonibojofevemixo.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/6a5d5c318811b77aa475a9fdaccd7528/dopudegalisopisipotuga.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983edd3fed2---33778425212.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f7fe8eb6e---16349781391.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6049c10e2---vunuxunutuvi.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609054bcca072---15236826928.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6df8172b30---23322277240.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/6h412g9pin4a050keka9so8787/78581380255.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/85765367867.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/gadevove.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/nerolutafetenenex.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083703b0be64---kususiberurerew.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/5ba28169beec4cc0c2a74cbe84c16ddc/worepenilifabin.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/93223966c4ff9eb0bb0987eb240ca732/8290057649.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/66508318203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=manual+handling+operations+regulations+employers+responsibilitiesPDF 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_off0000ea69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA69 17288 bytes
SHA-256: 87c05a3664fc040d5a2a7fc746eb611ca895723f4f6466a93fbb81cd42336b3a
font_01_sfnt_off000117ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC3 11188 bytes
SHA-256: c7173d686ff475e9c1b4e6a5ea80dc855a13d125dc5be49d9c50e43422208252