Malicious PDF — malware analysis report

Static analysis result for SHA-256 f031a5800a3532da…

MALICIOUS

PDF

78.2 KB Created: 2021-07-19 19:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 40d4f18ecc28f36f293b3a3ae548c416 SHA-1: 519230858e1e495039028b9842a0688ead5480d8 SHA-256: f031a5800a3532da4a3e1bcc2d768d169c657e3eedb798cf0483797c55c8a583
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609277ca851ec---29290525126.pdf In PDF document text
    • https://wendi101.com/userfiles/file/42205205287.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/sukelozipujesedanutefonet.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/7ea7a76b6ec4d56889c7bca3de6d2505/tusovapanaxuguzikekuje.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021060215421573499.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/f9bf2e28b317887229238ff902c01206/pidiluxufuzad.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/pewevuke.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/5cefde8d07796136ac3c30ca26c6506b/41144690331.pdfIn PDF document text
    • http://parentini.it/userfiles/files/rixigoxapirifotovonago.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce81097e5f5---71863944161.pdfIn PDF document text
    • https://murten-hotel.ch/userfiles/files/binakofisidiwodibojividi.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/3471830276.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c288b4c02---wogomubugaxaza.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/69618713638.pdfIn PDF document text
    • https://agatanorek.com/files/file/lezaloguzuwuwi.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086f831ac219---xuvujutel.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/opq1e9bp839joopmqg3da1j1b2/87724371023.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a5886dbdddca815c59226bd5b4886b97/fisogefizupinejidal.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/69841560528.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1132e7923---26294645628.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/tijuzidar.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f18d2001beb---89916279482.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/14569483349.pdfIn PDF document text
    • https://peterdegendt.be/file/givusenanere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=is+going+to+be+vs+will+bePDF 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_off0000d06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 10264 bytes
SHA-256: fa96f2b4232226e4e8bdea63d752f740626977753adcf2c62d766b34b48fd9a3
font_02_sfnt_off0000ffba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBA 17060 bytes
SHA-256: 090970574ff0723b0adc1c6772239b6eab90956cc4a7216ecb2004d744dfc7c2

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