Malicious PDF — malware analysis report

Static analysis result for SHA-256 85938cae08f1040d…

MALICIOUS

PDF

93.7 KB Created: 2021-06-29 00:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fd12017df42c29a6c4f0ad8c72d5d87e SHA-1: 3137c0ffdc535020165cd6a927336792fd52065c SHA-256: 85938cae08f1040da022b9d9cd45506fbb33c9f18c9a7c02fdd3658a3ee88a56
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f1e250545---sexavigaveve.pdf In PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c699a0d7b---togededawasa.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/lerosubesuvikafilon.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f42e89bb27---40323718069.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/569fb2edd28207dc8621f69721bf1f6b/96267303106.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/fvke0ojcalssu0i602bgaqf900/gidowagelizidugupuj.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/ee83619ed6a9cb4b063fdb36c606d0d2/3637533173.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85dd32fb7d---sojolusor.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/89428858840.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ngqofmq1bm8p5h4ll7kbungf2a/bagufasekup.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/o91us27c5vsjc8qgk47g1obr0s/30551419922.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/4d7f42e5dd92d28141c12c51fd4bed35/51872585994.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/wagubupefep.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729feacf221---kegovamofosuwez.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/91a4711f2e6f396e890bb2031bd547f6/46774888857.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608aedabc95ab---ganesijuwad.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/93235579099.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4f4690b6055007161b9bcc02a25f11cc/pawojujefuwenu.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/95540962751.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/xipagirelodogu.pdfIn PDF document text
    • https://motacademy.it/file/pigosoj.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87728860554.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/238204e24c07bf00af293b365e5209c7/bozubomulawijenugobo.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/d67b8c1751d37f117de5c4e6c79b481a/80898533765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=documents+in+pdf+formatPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00011de0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11DE0 17408 bytes
SHA-256: 2c6ab4901e465706c5977d465f60cb7718adddf97c184988abfeb1ac47e2a73e
font_00_sfnt_off0000efe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE4 17704 bytes
SHA-256: 8fa4cd6632c3bc9ce027a06fe8870d747bd16c5c47fe6f9adf3caad747d2f9c7
font_02_sfnt_off00013832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13832 10836 bytes
SHA-256: b4cb8a34ff51e6c6aeb6e6ed418755adf4ffce7ce7e1457d8d759b67583d0197
font_03_sfnt_off0001512f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1512F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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