Malicious PDF — malware analysis report

Static analysis result for SHA-256 8066b259d60de835…

MALICIOUS

PDF

95.6 KB Created: 2021-09-18 11:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 983b3893073eb72260140f7b489387be SHA-1: 9c26cac70579c8e8d768b73e8060de2e8aed2d41 SHA-256: 8066b259d60de83564f2c4cc9ac4e2b7d311b661ed884bcf81c25ddeaebdb52c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. An embedded JavaScript stream was also detected, likely used to facilitate these redirects or further obfuscate the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://krallarintavugu.com/upload/file/medotirufox.pdf
    • https://minervatech.work/js/ckfinder/userfiles/files/15364196280.pdf
    • https://fengshan-zhennangong.org/upload/ckfinder/files/pojilepokimose.pdf
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/jusikutokopulupuzi.pdf
    • http://eaupureinternational.com/userfiles/file/kukirezigobib.pdf
    • http://pk.mo/userfiles/file/naruwaxokobolo.pdf
    • http://lixupeng.com/uploads/files/54508457060.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161402dba519e7---54243798027.pdf
    • http://idolyokocho.com/js/ckfinder/userfiles/files/ganalubedugela.pdf
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/33275519028.pdf
    • http://dierenwinkelindex.nl/images/uploads/20271877831.pdf
    • http://sangtaoad.com/uploads/userfiles/file/82213911939.pdf
    • http://teplorium.su/userfiles/file/24745008797.pdf
    • http://sweet-sugar.de/images/uploadedimages/file/ximis.pdf
    • http://aqua4you.hu/userfiles/file/6584783384.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f95d704c33---58264576861.pdf
    • http://oishisushigd.com/uploads/files/33442049087.pdf
    • http://clear-es.net/yamituki-n/uploads/files/soladafute.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16141f35159e97---texewopivusuravosexu.pdf
    • http://teraval.cz/res/file/30959875620.pdf
    • http://koreaticketland.com/userfile/file/gavadipofagirirade.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=phone+key+java+game
    • 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_off00010d58.bin
56bac633c007189d0177d21013048036711da5cd1c637c5aff79ef7ec2d68276		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D58 19880 bytes
font_01_sfnt_off00014190.bin
f92e57ebf499e929b58c31284323cb4ce64f0a8e0b445d13ec0cf9d8c2bda88a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14190 10456 bytes
font_02_sfnt_off0001591e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1591E 16792 bytes

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