Malicious PDF — malware analysis report

Static analysis result for SHA-256 514dc01a830b5b09…

MALICIOUS

PDF

89.8 KB Created: 2021-06-25 16:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d07ca3ff0465cd7b7d83d7c76cb8f96c SHA-1: 6c4c90f3a1d2468a1461ffc32d30eb3d5801588d SHA-256: 514dc01a830b5b097d3fb8ff134d6b98a1b598fdee8e9b34134a243e667d7d18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URI links and link farm heuristics indicates the primary goal is to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://smidgel.ru/uplcv?utm_term=sharks+song+west+side+story
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/b6e78aadcbb69690e037188ce7a0c107/17888866287.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/2d1298951bff313c925234ce4e1d8ebe/8347377434.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7909ea6485---28385577986.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28f0c49c18---monuzonafadoxidilujolu.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160895eea71396---welotogovo.pdf
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/fejelulinokabuvipixojife.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807b51b4851---42747340779.pdf
    • http://faw-asia.com/image/upload/files/gaxab.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c55f900bdbd41449561dbf90fff224f/45943714504.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8702d4566---delelamazijokufav.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4n08a15vls566q5c086dbvv20k/71286179551.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d5e62c9835266cca1c2bc3cb88dbd53/99657013869.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bd8bdf768---wituwovewepakoroveva.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/4lc80c6pmgucenbi27b684fqn5/kotavunuzodutufolubuderep.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/6b26992db634c4bb37164bc14958ba73/safebodalidelixew.pdf
    • https://ppuhperspektywa.pl/files/edytor/file/80748534889.pdf
    • 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_off0000fc90.bin
5912122f5f71bbdd3bd7d023cb1b53f9f913000072253cbe176a3d3ff0567d6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC90 17500 bytes
font_01_sfnt_off000129cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129CB 16792 bytes
font_02_sfnt_off000141e2.bin
866de644c7b67e28b02420476e6d5cd174804dcc38097706ceb2185729805492		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141E2 10848 bytes

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