Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5bcdaba2a3d2ead…

MALICIOUS

PDF

79.8 KB Created: 2021-07-26 13:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f21d9480478e844f3a6c3c636de50e40 SHA-1: 9224838938655956b726eecf51d581283afeb1bd SHA-256: c5bcdaba2a3d2ead90edeb8a6adbdfa57e2c5e62d7f536efe2df436d45b79a2e
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that point to compromised CMS uploads and disposable hosting sites. The primary goal appears to be redirecting users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8511

Heuristics 5

  • 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
  • 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://fotofolliasanlazzaro.it/userfiles/files/31324884088.pdf In PDF document text
    • http://cutskytools.com/d/files/woparig.pdfIn PDF document text
    • http://rld-carbon.ru/file/degibosivi.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099cf7f2d0dc---53590825835.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e836272c606---pinexaponoj.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/b198f189059012a3c8a27367a15385e2/2364076633.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/60565229388.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/mikegazadetuzabaralaguj.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961e9caa4d7---daribumopedo.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48833056a---zofepajepatajanani.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094e7a334ad4---bekeji.pdfIn PDF document text
    • http://garderoba.sk/images/_file/12488991004.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/kezotimiru.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/xigexakinajadekanob.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ih565j7umsqk9j3vsemaom08mr/megetawezokokovejo.pdfIn PDF document text
    • http://asfalon.com/__files/file/dizomo.pdfIn PDF document text
    • https://primer-spb.ru/files/files/54827518167.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/7sv7n2rucq8ci8kp4gdfvfki9u/kutaxomogos.pdfIn PDF document text
    • https://bselink.com/userfiles/file/dazawupapalesigisabikaf.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021061720552173499.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/kufapuvonubonotikibabuza.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/hh6ut2ae2rbu9rl9mnfh4a3b51/foketilanaxinesub.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/d74634f66f99ab0be110d31a43462bcb/zupiwilo.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/tavitijalitisum.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c31b603b914---33871488454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=beautiful+song+soundtrack+by+bukunmi+oluwasinaPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 17640 bytes
SHA-256: 50fe6413f0a5ad35d4d8e7863c9d9e698950c975eeb2ec2d7f1265d3f2de27fd
font_01_sfnt_off00011b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B66 11404 bytes
SHA-256: 3ad2ab9196862ef38ed79b32a36faa88c69a12d17b09884bea32e228f585c4fe