Malicious PDF — malware analysis report

Static analysis result for SHA-256 076d4ab0bcc3fc7c…

MALICIOUS

PDF

76.4 KB Created: 2021-09-02 10:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d22b7fd0454179318d7ca116e8e81e79 SHA-1: e6f8aff6f5feeeb58849157f94a6338395186c33 SHA-256: 076d4ab0bcc3fc7caccaf4a9fbcf673907393c8d174db24eb2200423bbe12bcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for credentials. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://efnnma.org/files/file/69171038278.pdf In PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/38cb4d22b4766ec9be5b1b28f12c65f0/fifisep.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/ntfd67h57qi24hkg0veqf0tai6/49186960155.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/feforonufatajeriginujokij.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/79778501460.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094417d17d26---41926939947.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04964a42e6.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/86817985060.pdfIn PDF document text
    • http://ahchala.com/img/file/36394818746.pdfIn PDF document text
    • https://jurad.eu/files/file/xajoreribugadibuw.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/botaneg.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/rupuviwo.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/7er2ltdm93b4uh00q3nq88hqb5/97786524092.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/829967d066939d788694fc838932c62d/radiremunana.pdfIn PDF document text
    • http://zl369.net/userfiles/file/52136516147.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108ccea03f57---39710456685.pdfIn PDF document text
    • https://12waktu.com/contents/files/wimavezobikakupusepogob.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/85227675602.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ef119637c15f5c526a8e3f54fc374a4f/kunirodurosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=investment+in+associatePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a141f0e2498---kivuxutujukumafewamegige.pdfIn PDF document text
    • 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_off0000c847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC847 17248 bytes
SHA-256: 7def15a8ae49d9c50d17ed704d0908bf3120c685521cf08627f867862bb636cb
font_01_sfnt_off0000f4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD1 10260 bytes
SHA-256: 0b5a55ef0b24f5da2744f78ae4f840cc50f411fc032e7958446d9faf6d12b80b

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