Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fbf0a9e5b4f23b3…

MALICIOUS

PDF

87.1 KB Created: 2021-06-29 22:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec84eeeef1789302cf38ee63e398532d SHA-1: bc6972e8ed1a0921ec17ba424443be55e65908c2 SHA-256: 0fbf0a9e5b4f23b3bf86a2f6724344a2d871fbd08c801755751ef78c252e681e
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and link farm characteristics align with known tactics for redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9cc3bb073be01fe0a10bb973bac52e99/debatavidamogawurovepu.pdf
    • http://voszveszprem.hu/_user/file/76105917477.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/1c09f7ddfb46c837a894690378ad28d8/45088621629.pdf
    • http://lycee-elm.org/userfiles/file/kugukitojig.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c682989a80a---95640803983.pdf
    • http://agroanaliz.by/upload/editor/files/pekogofileva.pdf
    • http://archinfo.ru/uploads/file/dofasuboj.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160946864730b2---jamejipogi.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ebad85e72---89929676134.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ad5d3727---9045483102.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/0cl20477submtm8hsrj2p7cta2/82101517558.pdf
    • https://eastmanllc.net/ckfinder/userfiles/files/42180329819.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/51807294b4a77abc77a4eee7397c7f21/68353574305.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160942c77c8653---86064841401.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d476b51772---rejaraxu.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16088eedfe30a9---kojelu.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609642208a35f---78776242153.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/d48149e86f2703db526a712ec2e8e7da/bojisolonilawagab.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ec13d2741---47384873060.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094d90bcf971---48461898983.pdf
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/15161620282.pdf
    • https://superchills.com/userfiles/file/zojozamarudakujaf.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160d641784daeb---24057923255.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2d0a65e3b---78912352805.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=enterococcal+urinary+tract+infection
    • 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_off0000f48c.bin
bbafec893b2121b2c15aec7ff3c491f3fc2117cd0cdf686988820849f0eff037		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 16524 bytes
font_01_sfnt_off00011f5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5E 16792 bytes
font_02_sfnt_off00013775.bin
2cc13ef0f35c17aa2f2930e01bf735d919c94b64eff54a1722c0204545ff0d95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13775 10356 bytes

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