Malicious PDF — malware analysis report

Static analysis result for SHA-256 b046bf5ff7e44b01…

MALICIOUS

PDF

84.9 KB Created: 2021-09-14 21:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dfdfdbb64bc177d1d6976560675a9fae SHA-1: 429247212f5c19ce20b1e3f89838aae7f7211965 SHA-256: b046bf5ff7e44b01e9db90a5e131f7b79e7df69094877aaac36069c9a8b2b483
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many pointing to compromised WordPress sites, and one specifically to 'synerhu.ru' with a 'market helper' UTM term, suggesting a lure for potentially unwanted software or phishing. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to redirect users to harmful content.

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://synerhu.ru/uplcv?utm_term=market+helper+1.1+apk PDF link annotation
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ce9f9bf6f---41518637647.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/56076137956.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/xawolexixadeworufeduf.pdfIn PDF document text
    • http://pololanna.com/user_img/files/kedaresupag.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/vugojibezawereg.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/17178043095.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/137203887e7b0d26263b2ff2f1207733/tewagati.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/98532820382.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136925f1d53f---98215445661.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/tusojajoraxi.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/romikegobaguwejebuneli.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/17476218244.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/64033a55d1c6fccc54a4ead3b41bdc92/26993487125.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/tovulinujaxerabubij.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/ropojavuzefadaw.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/30344bd95d5bab8cf01387b613c02a75/nifubumoxuvazol.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///xoledorawajolare.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/44617809786.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/42f1bc846f7376e3e4b7eea1a7c15cd1/18779429763.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/zowug.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/refinabake.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109031357083761.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/29268868216.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16140816f32d8f---vaxegexegotejumofo.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_off0000e37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB96 10068 bytes
SHA-256: 7faba2854784bc0af1e2cf9232156f43762a11e83e021450e2a0cf1b7c824112
font_02_sfnt_off00011233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11233 19908 bytes
SHA-256: 6d023a3cde9597255fcb0fbfe1571a8f25e8de2bc2d244960b87102fb75c51e8

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