Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d86913f2e38584…

MALICIOUS

PDF

95.7 KB Created: 2021-09-04 01:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cac64df8515095039da6ec8cd22049ca SHA-1: 58ea30b2e33ed6ffd17803c4ee3a4dcc53366442 SHA-256: 99d86913f2e38584a1816cc5ff43b6ab264dd88d1580113a5a8365dadc23c13e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised websites. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to phishing or malware-hosting sites. The numerous URLs, many hosted on compromised CMS platforms, reinforce the phishing and distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://wastran.ru/uplcv?utm_term=gestalt+theory+in+counselling+pdf PDF link annotation
    • https://angkoronetour.com/userfiles/file/746776072.pdfIn PDF document text
    • http://exima.kr/userData/board/file/44272031648.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/6337044deec701141dc7475509abe0cd/farawepowivu.pdfIn PDF document text
    • http://usagimatur.com/files/others/87864409970.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/33732855986.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/29239379134.pdfIn PDF document text
    • http://chromavials.com/d/files/10521085913.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/dupuxada.pdfIn PDF document text
    • http://fteq.ru/files/file/1679770868.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ef2a0a983---faviforakasikoxagafafirat.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/39850932717.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/xezabivapufereni.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///wuragawivanumosip.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///1355220264.pdfIn PDF document text
    • http://alltechsro.cz/files/58471131723.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/89117380337.pdfIn PDF document text
    • http://ledson.ru/upload_picture/88780881748.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/lujumesepuzijupelo.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/4890bc59efaab67a5d635140ee2098a7/jegupulinasodaz.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/18296733260.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/55209860045.pdfIn PDF document text
    • http://mp-journal.com/media/file/daxepevidosawi.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210503203638765044185.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/fometakusekutixanonolepop.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/6a6b0623a781184de02587d10b2bcc1d/sonuxi.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_off00010eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAC 11152 bytes
SHA-256: e7ee6458d316cb8f263b1a0608e88a7ff17ff4c134be2571d6d4f798051e1fca
font_01_sfnt_off00012887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12887 18640 bytes
SHA-256: b83c6139b752592cf6fb2976927a59c87ebf5846362227690edf88834b57805d
font_02_sfnt_off00015896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.