Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc7ebb4b451ab02…

MALICIOUS

PDF

73.4 KB Created: 2021-09-08 06:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d50a11d6a51a04f091e46c5a31ef005d SHA-1: 2103505a5540e019d92085fb81c7659002b7e3b0 SHA-256: 4bc7ebb4b451ab029ad81c63f2f6bcdf6fc91051fe1e3fe6a56b45fc932f78c3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. These links are designed to redirect users to malicious content, leveraging techniques such as spearphishing attachments and malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=ones+tens+hundreds+thousands+millions+chart+pdf PDF link annotation
    • http://fogathajtohirek.hu/fckfiles/file/67427076623.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/rujofilenodikoxegoxu.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16123af13b8335---33149111793.pdfIn PDF document text
    • http://cmepta.com/clients/7/74/74ea2f63c40943e6497cbf70acaf7c81/File/52291237570.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/ruwezizipuzidede.pdfIn PDF document text
    • http://midel.me/userfiles/file/bizor.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5895d0435---vupos.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160851a5936634---17987692307.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/ccbbec97c6f5e4251985c04233147883/78797770848.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/52984466071.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/fc0161df1a078ad491ca7a6b5cd5b445/99908989121.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e278bad98---kusoritosag.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/u8o48cb7292e7i8cnkjonjqtv6/jonesodujidi.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/11320921578.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/20272367756.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/333ca770ebfca63a3434dd001d45ba57/87738531474.pdfIn PDF document text
    • http://billsky.ee/files/file/19603192739.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/8fba97f8d8610437cc89ecc6f2464247/82328536464.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/tetezovezinunololovu.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/jpno8rc4qd71a64qgspdnc3v8m/buliwuzukukireg.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160df1c89a106a---lujowumogijapofofa.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/xupetopa.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cc7fb1496---zugelogikozapodukafi.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/kujezabazefomexoga.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_off0000bc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC87 11008 bytes
SHA-256: fa87c23dc3bfd6eaaf33df6408e730f9cc69c8208a06dc00aae5850afb0bc54c
font_01_sfnt_off0000d5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EA 16372 bytes
SHA-256: c1a5e4a4abe72ca3c38e846d58a01c2ce89f85920d2a5c1de44d04fd1c2565f0
font_02_sfnt_off0000ffab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1