Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a48bfa7d43d235…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 20:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a9c1c0c49eb6d3d1e3ab8f4088dd0249 SHA-1: 715942184089cdfad5788a5ab8b9cbfb74f9bca1 SHA-256: 71a48bfa7d43d2352c412cf2ea18e72ff280311f73ccd6a752a5d48bdab7f728
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://vibanghanoi.com/uploads/files/20000331986.pdf In PDF document text
    • https://epiphanych.com/images/file/65318055831.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/90409843705.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/81282865454.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210914024802131.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137c1526adda---18287671061.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/68690973035.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/4246158094.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/90022318705.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cd5c5d79a---sinejomasuwozuxesab.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/fiwixomivutofo.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614483ec64a99---folorajiwateledaxuw.pdfIn PDF document text
    • https://dukupahit.com/contents/files/7488648184.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/39937e0ecac16bed5d17c5ae0e7a81ec/62774678652.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/68989177335.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/zosonowopabadixetipevano.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/61i7undlioqjhsg91dj5o5hihp/41960361138.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/rudofusozofusunowor.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/7699985509.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/7213811792.pdfIn PDF document text
    • http://robbes.nl/media/files/pemin.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/megonakirugoxozadopaxo.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109071106256453.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/4456570380.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/loxarirosemapelarekulume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=netin+jakaminen+android+puhelimellaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAE 16480 bytes
SHA-256: cf9067ac23a3c95e1b8df3c49feb7400c7417dd92218b1abec531d230944b439
font_01_sfnt_off000107a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A2 1728 bytes
SHA-256: 164b17f13be751c428b8a7847bfef4401e4c17c2bf41cfc2fceec83f5d69c6ba
font_02_sfnt_off00010fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDC 10788 bytes
SHA-256: 580afed84a97fd1b11538c6e95a5db36fa445f800f60fafc8baf5072cfb8e951
font_03_sfnt_off0001286a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1