Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3bfd0714acfb0c…

MALICIOUS

PDF

87.8 KB Created: 2021-06-28 05:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29bb4e32b68393c185d7c40d3cfc974d SHA-1: db21c1cf39eec449cd845c16c62c050932a1c3bb SHA-256: 0c3bfd0714acfb0c03569628ed8044a0f971b551bf2629d0568ad204015a4b31
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 WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics supports this, indicating a tactic to leverage SEO and compromised infrastructure for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://ketchas.ru/uplcv?utm_term=i+wanna+love+you+is+this+love
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcbf3b9bea---5431924932.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8acecaa63e---sosoduwogaliwep.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c924af000ad---83729302273.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092d7564506d---56364614400.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3b9e09e98---pakupokerikunulusanidin.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c9b943791---lasaxu.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c6994b3bb---59599686254.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/k58r2pbhnhfjjsagqpdeiqbn2n/81629412776.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/liruduramipufe.pdf
    • http://sjar-tech.com/uploadfile/file///2021062123415816.pdf
    • https://chinese-wall.tw/upload/files/jolopuzesagep.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af3df90c4b3---sasojemaba.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/aa5upaes3a9pkuvnfbic6623l3/80490575490.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb6e2f065f---39453600792.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c886238f081---63204406429.pdf
    • http://kawoka.com/userfiles/file/fubowiwojawoveredab.pdf
    • http://1hozain.ru/files/userfiles/files/gubedovepewomipefoxogo.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608844dc68def---wezefuwiditunixadoj.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/593e6659d4e45286b2de855050a66454/fenidarasimikoseborutas.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/47293os3vlahsgvc7a0hh09c7b/92512877932.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/7f4dc298b5d9cf737f43cc7450a4ad85/5446752710.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608366607ef79---goxamewubalepaka.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5f926e729---82101498232.pdf
    • http://optikametuje.cz/userfiles/file/14969951381.pdf
    • http://hotelsandmartin.cz/files/file/56972051372.pdf
    • https://pima-alarms.rs/slicice/file/49351061801.pdf
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/d59182608343f5f519300c5e7289ad75/jugokejilokipesavad.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d877.bin
d61e99532967601ab5c183249b1c4783e96ff963a46f0fdd3bdf8018d4b520a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD877 18856 bytes
font_01_sfnt_off000109c7.bin
3b43b4bf7ac3e6f0ff3ac056188e6e05984dcd373824cee482f2ab15331c8167		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109C7 6420 bytes
font_02_sfnt_off00011fb6.bin
3ce8b5b3c076012e58ef0b17bc16ed4a82467cd150ca02611d22d43145df277a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB6 10424 bytes
font_03_sfnt_off0001375e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1375E 16792 bytes

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