Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a2e79025c5173d9…

MALICIOUS

PDF

117.0 KB Created: 2021-07-22 16:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 79b5fafa2409967faefc76d3939bb12e SHA-1: 7045335ab5f3827299793ee58cb21288b0c2a08c SHA-256: 2a2e79025c5173d90ce0f455280533ea85f98ddb3f1625fd46fc41f3d7ca0e67
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories, likely serving as a distribution point for further malicious content. The presence of multiple distinct hosts and the use of disposable hosting suggest an attempt to evade detection and distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a781dc690---superezebibegoxaj.pdf In PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/f6181003f9b30f09052d9859a9852dc7/lenunav.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/xudotegi.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a0e941315---5903040974.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ce5febd8d---bigebiboladiz.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608139bf0f345---31317457623.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/87552068308.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085082ce0375---62073165837.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/17231300492.pdfIn PDF document text
    • http://goldenrulelodge24.com/clients/860883/File/57852050315.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1a364bbcc---3055745816.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/40dc7c5c07c53bee35043e6bd1151922/xoduwufudaju.pdfIn PDF document text
    • https://service-panev.com/userfiles/puvavalijizidexe.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb35c2e001---84749917625.pdfIn PDF document text
    • https://digireg.cz/upload/kevutiv.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8fee30a8cd1479f4c3fc622a887edb5e/88793925170.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5237dd97f---11139299585.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/22f26cba808159a7a269b7a58adb3646/ruxugubekiretezexeg.pdfIn PDF document text
    • https://asi-filter.pl/files/file/naxapoluxatemugip.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1e2bdb0bc---tekowibolefimebekezum.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/retepumunukikuxovojadot.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dc0720ca9---xawijelezekoretagenu.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/bukopipoj.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc158924fd---xikojitefetilawiturorarew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=chapter+6+anatomy+and+physiology+miladyPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16420 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C37 11152 bytes
SHA-256: e97f4df4df8cb69334c43486a949890b29e5c1082383ae5f2064015eb9ef2b6f
font_02_sfnt_off000195fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195FA 17380 bytes
SHA-256: dbb48f006acc3da5b2cce656b73fe2da7da876a599a7151fe97e1a6ec7b5d0c1

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