Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4b1dc4c2ff2958…

MALICIOUS

PDF

92.4 KB Created: 2021-09-17 23:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f540d64f57a595b0085e2f9a4aa2344c SHA-1: 0635c6a110dd0cf93f17244c4c09c96eae7ed385 SHA-256: 4f4b1dc4c2ff2958014519ed4de7cd69c4a2bb247fabad8d9d4a3406d5977741
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=tv+show+chips+characters PDF link annotation
    • https://masterjobintl.com/ckfinder/userfiles/files/sumar.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/80405914414.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109030652012390.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/10472266369.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/65119425927.pdfIn PDF document text
    • https://cowik.pl/upload/pipikexupopa.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/7331070497.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/bigesefukefur.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/xajepuselipimud.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ee2f11441---xilosurumekupubopoda.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/21307918906.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/68183820277.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/peninut.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139ffba8cfa7---jafijobimufiru.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/batoniju.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/29029063984.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/xafelove.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/mematatirijofopazowinit.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/mebofadur.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161389c3354cb8---wonolor.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/78206712203.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/27258921354.pdfIn PDF document text
    • http://autovoda.ru/upload/files/dapunit.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/42198216522.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/zufosaxosiminepuvix.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/mimadonokikidufolepo.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_off0001031b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2D 18676 bytes
SHA-256: 9e0c41813247681741508f764860752d401cb655a50bfe55f1541c7fdf776e7d
font_02_sfnt_off00014be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE0 10436 bytes
SHA-256: a914b0c894a9705b4af491f9cc5640aa6594ed4b44a10117992d085b239c1722

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