Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0850564a1ee88c5…

MALICIOUS

PDF

107.0 KB Created: 2021-08-02 17:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8de2bbfdded3974f5b1e4a40efc91dcb SHA-1: f44c2b68db91cffa5c942fd414d627a599817b67 SHA-256: d0850564a1ee88c59a999991dfa57cc110bcb0f007837c76ce93cbfe2bddf2d4
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites. The presence of multiple links to compromised CMS uploads and disposable hosting suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://blossomtour.net/FileData/ckfinder/files/20210728_766950B428290DA1.pdf In PDF document text
    • http://zentrumok.com/userfile/files/74145968638.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/prop2727c6ou81rca37qadhjf0/63338480062.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/751392b53df374db5771e1a433324c83/93408908411.pdfIn PDF document text
    • https://dm288.rs/slicice/file/fedujelafitabogu.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/tihrg242jtk5ac014o6jsmq2hi/surajadofalakifezevexu.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/pufujupina.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b897a88918---vopedubijodosi.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/vawewojiradek.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/migujiwomoxu.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/27627528844.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/fawaweloxupuxogujunab.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/7115935572.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/c1a804b6f823f2987349d7bee8356381/fudusozozuf.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/56079710828.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dfc100c13c4---lefuwoxaso.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/3oq6bott1pa0gk0ck9mlf9b1v7/zixowi.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/007451ae62bd934b7d6f49bf515a8200/lezufunoba.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3916e87dd8---54670988072.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/irerfm4hu14nitlsotvqj0e7hd/80995295812.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/27468965430.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/58579744068.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abce5d239da---zaxemo.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7506ea1822---28956971164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=gba+cheat+codes+pokemon+emeraldPDF 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_off00013d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D48 10960 bytes
SHA-256: 8657ebf1a6ee540cfb4bdf3d8d4248b432161be3496d3009a1e980c685e63a29
font_01_sfnt_off00015652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15652 17024 bytes
SHA-256: a0de5dad712d46a7268af9e72d261da1fbf7b85c25f60c71612d686dd7f5ca93
font_02_sfnt_off0001828a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1828A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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