Malicious PDF — malware analysis report

Static analysis result for SHA-256 e691c7aff26fe72c…

MALICIOUS

PDF

90.4 KB Created: 2021-08-17 00:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c7bac2242fc20cb91c04306cdf068c86 SHA-1: e71ffbb29c23bf2b8a27d680f79f938829c9faa5 SHA-256: e691c7aff26fe72ca9c6c33089ec532c1e3cddb71f7d4c81d9f314d598e51428
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress sites and disposable domains, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of numerous external URIs and link farms indicates a deliberate effort to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://blackhorsesc.pl/userfiles/file/dagago.pdf In PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/03dqgclb1u7j5cgrvjrli5eae5/1836633513.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/xilosovanunizavipizul.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/c1ee54bcaf9d8e9c6535c7754cde9310/gamokenanazukanag.pdfIn PDF document text
    • http://someteme.com/archivos/_20210621164510.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608778633b018---kuxagi.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/xisumubarofavibaz.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/cd46c56e00acfd65e02a1177c21c0803/dosexa.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/cd4b76df2a0503541198bf3bbe424d5f/97054140363.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/xelozikofowuja.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/6214897211.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/29445062164.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/c99725f10c68b8d76f5356b74f2dcd4a/lusan.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/neduto.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/690157765.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/98694997510.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609062ff98cfe---89481156546.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/bezolimodu.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/levetesu.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8afa4c2a2---54879654822.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/40567167522.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/48ebbd00a227e235af4dc7443779d56b/kufigowuxijagajagaz.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/vodozasibokar.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160821bb6d83de---41756353954.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/48578213361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+long+for+painters+putty+to+dryPDF 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_off0000fccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E6 10964 bytes
SHA-256: f3e852d90878d37759537e6dac536c07fc0b764dbc2fca0f5f7c75dc29598273
font_02_sfnt_off00012e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4D 17152 bytes
SHA-256: da0cba2eae91834fdf022cbf437e1cfe3c352fda6e06e2324354c02d091eed36

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