Malicious PDF — malware analysis report

Static analysis result for SHA-256 d852dbab5d7d5f0e…

MALICIOUS

PDF

76.3 KB Created: 2021-09-06 11:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5517861a3795334f0203380bd3665ec2 SHA-1: d88e5b2c904b6092ab73a3bd5747bb62ea3e66b6 SHA-256: d852dbab5d7d5f0e72bfd31e04e7293f2208c0e0d2099c2ab9e286b042a02464
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. It contains numerous external URIs, many pointing to PDF files hosted on various domains, suggesting a phishing or malware distribution scheme. The presence of 'invoice or payment language' further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/d9b3cada4164c73fb4229e9cd9108f48/48034052580.pdf In PDF document text
    • http://afgventuregroup.com/cfiles/file/tisojivijudenevotoxam.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/gasepiget.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/63944688426.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/27091253081.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/99826049125.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/41778368407.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/mefar.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/eqnvionvtu962okobk1ielh22f/24460777144.pdfIn PDF document text
    • http://csp.hu/editor_up/40883043131.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb281e4879---wolarabagij.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d41a2abcff5---52956085628.pdfIn PDF document text
    • https://auto826.com/uploads/files/61344842383.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/35573777805.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/9cf28b29969ecaee6c1b012057ce9017/5084890663.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/12253594777.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742b5ae2e22---16584243308.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/99360236108.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa2090036---pafabunu.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/varajumorugevadufates.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-8-31/20210831204543909485.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c156f38e435---90882566087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=anthem+bcbs+va+provider+manualPDF 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_off0000c345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC345 17348 bytes
SHA-256: a94a1acf814950fe1097af733221f79a9ecee66638ea595bbe63e7b096522de1
font_01_sfnt_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 11068 bytes
SHA-256: a0458aaa5bb8e96efc7b29c6e4251b3f7799c693de1569b093db853a47be3bb1
font_02_sfnt_off000109e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1