Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24156eaf632515e…

MALICIOUS

PDF

75.7 KB Created: 2021-06-29 16:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 339e7e51f3cffa83d695a8ee4cded742 SHA-1: 08e71ada8f9fd3e1c7bd1fb1ec8cee96fa441827 SHA-256: b24156eaf632515e698b6a975679fc5b772054621b6316a3ca1fd9dc94fc276c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting it's designed to host or distribute malicious content. The presence of embedded URLs and the nature of the link farm point towards an attempt to lure users into downloading further malware or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160710fb16762e---32746202067.pdf In PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b1d86c080---433079779.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210627042202.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609dac6fbf2e9---59371732945.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/0oavihlo3hij9b9o3kdlot9a8r/427243015.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/318a81415de1efef7d8dfa04840847ce/25950556655.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5b89f7f286150bb39f9f7fa787bb2899/95434390278.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/56200353336.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d13fdd95f9---18642630035.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/1548394b56bc422aaea10fa05ec731d1/xobagofisutod.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/67b24aeef43425ff5fcbebaeac8579f3/boxerojexatakijudidoniwad.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/batuwadejikenidefijed.pdfIn PDF document text
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/movupokukusoselezu.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cedbe5f171---kuravufanazozamuvijewezam.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/13624137606.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16087572d446b6---wokemugukifigewoxufezeze.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/udjmha27q24g3vvh3fqf6n0ni4/jozunujepexokanesewonowi.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3630a85fb---3580948939.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0eacefc85---96287364844.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/8jcompbr7a4tt6g7kfclsot5js/xakofilokuka.pdfIn PDF document text
    • http://longearedhounds.com/clients/65743/File/duwafubebaxolugupagina.pdfIn PDF document text
    • http://bjjiffy.com/upload/ropexidukizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=aluminum+corrosion+in+waterPDF 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_off0000c99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99F 10560 bytes
SHA-256: 33d572b7565e5accb106a8e7a31a35c01db07081115b64ca1fc5d24da0b24e64
font_01_sfnt_off0000e1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 15720 bytes
SHA-256: f333874c392ac7d676d8abb7214a70eb57e2f32b5ca3e98b18629f0f7c81206f
font_02_sfnt_off000109ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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