Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a3088117bebc63…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 08:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e97f4c49bcf67ca7d080132a172cd9f5 SHA-1: 0414b19bad6ea079b28397501320bde52ddde7bb SHA-256: 16a3088117bebc637b9504d72e4e19433ccb6164eef8f209e4977d6e0816fb95
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various domains, including those hosted on compromised CMS platforms. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://medvor.ru/uplcv?utm_term=mantra+yoga+meditacion+pdf PDF link annotation
    • http://sensitiva.fi/UserFiles/File/58128544796.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/79588879806.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/sadejofosu.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/badabupidetorexavijamirod.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3c8f6378a---jatepu.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/mikinafariz.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/gafowukapajiwov.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/lepopugafedibevogob.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/xanutekepanegabora.pdfIn PDF document text
    • http://whatdwellswithin.com/file/63176907330.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b074db15f1---48602337297.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1593c16043---vofipakorebalazu.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebc7eba89f---samabugi.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1626141769.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/feged.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092500f9cc03---74365526187.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/31345267843.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bd1f035fc---88273226217.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/xarosixewadagi.pdfIn PDF document text
    • http://ozari-ua.com/files/file/gunidifonurutupusoga.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/pibimu.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160770fcf36e1a---pafimeb.pdfIn PDF document text
    • https://ksuskalology.com/images/file/79847827788.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2c0091751---2691874027.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/piluxejiwele.pdfIn PDF document text
    • 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_off0000dbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFC 10856 bytes
SHA-256: 9d6f049050c54d8f4e810d756c9d853b09c3efed6ae50830fdf625d4aabfd115
font_01_sfnt_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF2 18680 bytes
SHA-256: 3b21d011af1c7d8d0dfd017612365c6dc2a7b32a76034cb66de60ea9e4af5875

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