Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7b092e73c80560…

MALICIOUS

PDF

87.9 KB Created: 2021-09-02 03:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fcb896a47163cf52f3a7b7d322753f71 SHA-1: 63da097ad76c578b285810be4e985641516b923d SHA-256: 8e7b092e73c80560945af19991df5ce2b48ce6d840c66b7617dde3202daae4d8
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. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, forming a link farm. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://eventechsite.com/files/files/26507325932.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48a13bf12---32416644338.pdf
    • http://lammensfilip.be/uploads/files/48339470949.pdf
    • https://topupdana.com/contents//files/67361073175.pdf
    • https://seerupit.dk/assens/file/patavuzakonu.pdf
    • https://mcdpiti.com/userfiles/files/rusuvoluzojazeso.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/4f28acc90bd1adc4d7e9278c3173ef68/1802238943.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/mmnbp19k7aom53tdh57o445b56/kezujavupuvixafozuborura.pdf
    • https://studiovizia.com/webroot/img/content/files/98596894024.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16077eccdaf3fe---15350829042.pdf
    • http://devveb.net/userfiles/file/vavetazetagez.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16120241cea868---36637119696.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/5397aa1d2e3e4eb77517562f8302d96d/82197388246.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/34dvhsu3r2sl4beme6ma60jmmj/fugowatemoxunugaxubir.pdf
    • http://ruresept.ru/files/file/witabe.pdf
    • https://elcoengineeringco.com/userfiles/file/55859854255.pdf
    • https://audreyheselmans.com/_files/file/nidokamurebofemiraxexape.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a834df920d8---mevur.pdf
    • http://meruzhankhachatryan.com/app/webroot/files/file/75780736759.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/f14536019af02aa565249828a18f0a2f/jolunumevebis.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755408403d8---81849562432.pdf
    • https://art4you.sk/editor_uploads/system/files/9924969008.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=to+the+lighthouse+mrs+ramsay+character+analysis
    • 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_off0000f189.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF189 16792 bytes
font_01_sfnt_off000109a0.bin
03cf4ecdef0d20a09a9a1e6fde2b264b4b5b8deafa48e76b6008f59134483e17
pdf-font-stream PDF embedded font (sfnt) at offset 0x109A0 10856 bytes
font_02_sfnt_off00012294.bin
371e491a4537e4786a800ec86a106fdabf4c7837a5d9589cd302ca93b648d8e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12294 18192 bytes