Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e8c51f7f7fd4f88…

MALICIOUS

PDF

94.9 KB Created: 2021-09-10 08:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6471a01e27f8aaf8b45af40b2c7eafc9 SHA-1: 347ea1f694c2c46224809e78920c1edfa9d2c0c0 SHA-256: 0e8c51f7f7fd4f880a4ddf4120945f7d92bdd76be595bebad16dde4e84497039
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://xn--eyt274i.com/upload/files/97737209494.pdf In PDF document text
    • http://horizonpestservices.com/userfile/31396734340.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613820994bc92---komix.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/wofogutolepigiposofarilod.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131f2b126c36---zazodujitufuwokofovop.pdfIn PDF document text
    • https://ccskin.com/geektic/files/72108087104.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/fukudigufaxevinenama.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/3320307021.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/34515351000.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/b48a7843514859c7080fe0a994acb6a3/47795748962.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/mopinewila.pdfIn PDF document text
    • http://newcityhk.com/userfiles/87152493383.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/18b91e77b2c806950214551b39cd6016/kabisurewonutud.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/neretawiteketi.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613864e807eda---dukiviseresedijepenak.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/manopenufov.pdfIn PDF document text
    • https://rm-parketi.si/uploads/latelejanipenezodoxosox.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/nijegukefew.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/13261157412.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/95403126325.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/37621778860.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/desum.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/44854620363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=traffic+rider+free+moneyPDF 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_off00010db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB9 19052 bytes
SHA-256: 89537a002432ee12913ebcf096310e23436f05ea5fb29c87de566328d21cdd5b
font_01_sfnt_off00013e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15650 10404 bytes
SHA-256: 361a395d640412587b4c56459beac4a9ef53f88baaa3fdac425cbbd80151f292