Malicious PDF — malware analysis report

Static analysis result for SHA-256 b322d353dcb84604…

MALICIOUS

PDF

89.7 KB Created: 2021-07-14 05:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 18c3711c03f6247ce1df093ec83e4c7f SHA-1: 931c7be0925e4645a9d288664cfb75873e701817 SHA-256: b322d353dcb84604e62964617acd9a16da04d88952553ee5025bc83e9758ee26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely to lure users into phishing scams or download further malware. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/b27a205ee373d956923f59d80192488d/sigibonarelod.pdf In PDF document text
    • http://yasaitogo.com/uploads/files/derekusatidasulure.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/repapovanuzawuda.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/22387173193.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/kozemanegodivurix.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160983f9666a8d---nefovofetabafodo.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/6e2735c1d39ca3bea9d475c85b0b3078/15770965149.pdfIn PDF document text
    • https://negaratoto.com/contents//files/52483698050.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/bovijisinofefeg.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078e07cdca06---59886205293.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/ff01df68deff98d26d7a6b38d6f3f23d/godal.pdfIn PDF document text
    • https://giustofiori.it/file/kikikim.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5bad16163---bepiwenegonimixiniponexev.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/7g7j7ru8ts9pe702jbt4c96kma/rapuzosusuxurat.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/2602cdd3dc99679d9731925ae42835bb/kolunalomilokazenerit.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/47842253575.pdfIn PDF document text
    • https://www.leeja.co.uk/wp-content/plugins/super-forms/uploads/php/files/d8ab47a462f886e730c550dd8875363d/lofilalinefisugetudu.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/zixatigisas.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/pobedaxubopitefe.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/48678768926.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/winiwoxefe.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/45340701554.pdfIn PDF document text
    • http://airsoft1.ro/files/file/26051156445.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/gp3pt7hcoehrjb15h8dv0m9r97/86516276736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=game+of+sultans+cheats+2020PDF 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_off0000fb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB04 17744 bytes
SHA-256: 308c3f1a6a7bd5ed06507cc908602a8cbbf8e62994ba4a5ac698f47c8831b5b8
font_01_sfnt_off0001298e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298E 10788 bytes
SHA-256: 96312855fcab6d990ac77186a0a73956e9e47d03390bec52418cde223b4cb587
font_02_sfnt_off0001425d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1425D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1