Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e024dc00eaf6116…

MALICIOUS

PDF

105.6 KB Created: 2021-09-15 14:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dd4f4f65f9dde65b3bf41d00e87cf6b9 SHA-1: 0cf13057b0c361f96c6cc0d553207e9cb853dbbc SHA-256: 8e024dc00eaf61166c3e1a92e3ceca1b50af2a1c3a581b4baa6b90a40e66a2ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating phishing and trojan activity. Numerous heuristics indicate the PDF acts as a link farm, directing users to various external URLs, some hosted on compromised CMS uploads. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://coretry.ru/uplcv?utm_term=the+mentalist+season+3+123movies PDF link annotation
    • http://geodez.com/pliki/file/48171603251.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/lulolukugopibave.pdfIn PDF document text
    • http://video-cycling.de/files/file/vavatibamudakinopafig.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/xowotabo.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/21169567886.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/85369271733.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af91e023c1---xisapozupefo.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/zokozof.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/kegapumaw.pdfIn PDF document text
    • https://thehouseproduction.net/file/66610413910.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/32286351581.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141bc07515fc---38017167307.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/lunisamulabawopupa.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135219e48491---44347250175.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ad981f39604a483b2302c9089030a7f3/vabelopavirezixaxafu.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/42485313798.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/tafubaxigetitaxerow.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/89614004191.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/46661306417.pdfIn PDF document text
    • http://zuche0551.com/upload/file/dokazoduvagileb.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/busenewurejupumopasezu.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/47110504103.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_off00013690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA7 10644 bytes
SHA-256: 9e7712bc108987839c5960ae40274e65e0e901329b1712d2b5ef91f8f5d657d3
font_02_sfnt_off000166f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166F3 19072 bytes
SHA-256: e65b34de2c77ce03361ce75b77f65dcfae07cfc675f9282d40360f05cfd9d332