Malicious PDF — malware analysis report

Static analysis result for SHA-256 8748b2a873556688…

MALICIOUS

PDF

74.4 KB Created: 2021-09-19 11:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 72ffc75e662ac126fad0ac22478f28db SHA-1: 50612ce5c7d0b912b4d3903e15d0f4a1f99d4651 SHA-256: 8748b2a8735566889c663c48a20c35ebe08ffb4e0ba21089e89e6b3271b4b8fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The document functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. These links are likely intended to facilitate phishing attacks or distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://laborke.ru/uplcv?utm_term=odposlech+mobilu+android PDF link annotation
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161304e1170970---86222862412.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/narodode.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec9fbe99a1---29386175123.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/7767216074.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/jimogegatumurimeravosufuw.pdfIn PDF document text
    • http://8njl.com/userfiles/files/73996909491.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc5743115a---23846723233.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349cd009cd1---12315092014.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/binatojuf.pdfIn PDF document text
    • http://yjccnc.com/upload/files/46234557152.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/busivulifub.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/40818453365.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/38106985694.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/2150253479.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/88399503157.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/lexixalogoze.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/zasirazuzekituzemosir.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/zitanivorana.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/rakovazuvunoxojozopa.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161319c7a85dac---93635475386.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/taluroxawavozazunag.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_off0000bc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A3 10948 bytes
SHA-256: ee397d2c3cc8681e1f0702f98a44116349a5c3855e1a7713669ea4fafb286dc9
font_02_sfnt_off0000ed80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED80 18016 bytes
SHA-256: 02c14e70902dd06bc4233a7d8d6b8cefada0c46698e65b83c908571fdf1dbc82