Malicious PDF — malware analysis report

Static analysis result for SHA-256 1706d5da8f21368c…

MALICIOUS

PDF

83.5 KB Created: 2021-09-06 20:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 392e7ae98c91db7bb5206298190217e4 SHA-1: 08393ec166ad1669803d9600ee70edd80b6f6516 SHA-256: 1706d5da8f21368cb88a78b88f9279737653091a6b39d6db870c71f12918e16e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous URLs pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest an attempt to trick users into downloading further malware or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=lonely+planet+east+coast+australia+pdf+download
    • http://fcvperu.org/data/fcvperu/userfiles/file/79620505983.pdf
    • https://mimpishio1bet.com/contents//files/98710361207.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/kepvq34ra2t8q3enq0oh661v95/98342366130.pdf
    • http://ellev.fr/upload/files/82927196379.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8f35770dc---jigimexapatataj.pdf
    • https://hankilfood.com/upfile/files/93088478063.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b5abb5a871---96007304215.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ec7c82be8---76938402963.pdf
    • http://bulk-supplies.com/userfiles/file/tasumumajurit.pdf
    • http://harasim.cz/uploaded/files/jijemotital.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f61138967e8---notebazegigetoxogumewi.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c8991bd2d64---vajixiv.pdf
    • http://fructusartis.com/i/File/38378738798.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9899eaa62---zaruwuvilabivakoxovonol.pdf
    • http://www.findvoters.com/userfiles/file/balobad.pdf
    • http://coffeetuanvang.com/Images_upload/files/virajibinejefenezepa.pdf
    • https://www.winsum.frl/ckfinder/userfiles/files/70263943425.pdf
    • https://steammining.com/userfiles/file/rorifosogatax.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609fccf4871ba---99153059653.pdf
    • https://www.passion-rnd.com/upfile/files/2021/08/25/vakugimodo.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/df88028feed74a275451549770398ed2/89680305353.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/c3fd90abf9a9fb57bc1609d615a6a067/nipizinupud.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b167361cff---21787225144.pdf
    • http://allaboutdowney.com/userimages/budowipivemupozapesosuti.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075b823d6329---85788176299.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e045.bin
c83645a653365e0fae664a775047d9ffa27079aff00a3a3a5523560a155c3aed
pdf-font-stream PDF embedded font (sfnt) at offset 0xE045 10868 bytes
font_01_sfnt_off0000f993.bin
c76937ccb0789de135b100b0eb996ccc3495301c4b76e4fece4725b3cd58aea2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF993 17632 bytes
font_02_sfnt_off0001279c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1279C 16792 bytes