Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4e8b50520e91fd…

MALICIOUS

PDF

80.7 KB Created: 2021-09-01 09:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4191897c45d9c1013ec46daf48b831af SHA-1: 3754de3fe401754383ec7de736e446ce035d07f8 SHA-256: 3b4e8b50520e91fdc7945ad162de75190cdc238ac04b5733b83c76f783af23f7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised WordPress upload directories. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://accesoriosalmayor.com/images/userfiles/file/92639699393.pdf In PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/9962f6a3c714088f0af0662674f8cc22/73530625068.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/fenoxekujarudonok.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/30524290590.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/a99ea562ac1c1829dd6ecf0a820d1d2f/42810883616.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/govisimawupe.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/jerulojuraduxevoxeduxixa.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/gizababe.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161124e20a3ae3---57350653735.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/zepin.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/7339467316ab5f05613ab42fc5785001/57334008418.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/kfq4i5m9rl3u1vch3gvn0o6ufu/36995918387.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/ffc66267319123a81879175decc6948d/lelolatadoropafowev.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///78832766809.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/tefazuxinopadosarap.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210622_185957.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/puwuwuforipilurivutesofun.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5332040d70---93548493102.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/zuzawatina.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/vufejasineduwazigifijuzo.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u6fuj1lt589eda45jh2cmng707/4492363845.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2bafc5bec---xokezomefeb.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c81edf892---14937108932.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/vipokikasukorus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=canon+sx20is+manual+pdfPDF 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_off0000d344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB56 18552 bytes
SHA-256: 21a6f0420f53672b95cd5a779fb8010734151e5350b79854f147e438a7e75327
font_02_sfnt_off00011c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C50 10804 bytes
SHA-256: 3b893845e6cb8825a2fba8e18914330cbd58bba8ac665fd5e5019ce1395101e2