Malicious PDF — malware analysis report

Static analysis result for SHA-256 014977fe7fb7d87f…

MALICIOUS

PDF

83.4 KB Created: 2021-09-05 16:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f715414f94fcb047beeae58b8d43498 SHA-1: fc40a683fcdf70d1f4e9f00b9953a6e519d6c4ea SHA-256: 014977fe7fb7d87fa7669611b149af62a45a5f06c1bfcd3b9814bf398ebb2c7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

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://dolnoslaskialarmsmogowy.pl/imgturysta/files/mepikunod.pdf
    • http://delve-cr.com/uploads/68392020911.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/elbefttscvrno4phdlhg8kc7m0/suvan.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/d2vt1u75knv2k8n88if8lpka87/tebibudop.pdf
    • https://searchkar.com/ci/userfiles/files/gapokalevizobuvavivi.pdf
    • https://grandplaza.bg/uploads/assets/file/33192284729.pdf
    • http://ssaisarang.com/ckfinder/userfiles/files/16956705233.pdf
    • http://davidhammerstein.org/userfiles/file/66104023860.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075713dbcd39---nomegenatetufo.pdf
    • http://abwcrainhwy.com/uploads/files/74275313596.pdf
    • https://people11people.gr/uploads/File/wuvizojopadin.pdf
    • https://anthonygillant.com/userfiles/file/duberukenebon.pdf
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/rudizezigilabijefisar.pdf
    • http://planet-for-events.de/userfiles/file/zurobekuxorasi.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109964484f2d---75635111907.pdf
    • http://jrmhandling.nl/upload/file/vorakipewexaxusaserotu.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9bc0dcf9d---25401390398.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/a26524d34a2fed7508d2d1664dc844a5/medosulo.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a8502ef77---rivubujupujejerabubuwap.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c810738f4---783325239.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4ad521d36---zosifezisatokinubomo.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/gerozuvil.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/n089hmo54b16co8kpoiittrkh7/gisejujuzukononamavaga.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=naimatullah+shah+wali+pdf+book
    • https://lapdonline.org/file/3748354902.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8e3.bin
8546f1bc23490b5666440ce16d0a509436b19c8e155f2110db1ec758221d026d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E3 10824 bytes
font_01_sfnt_off0000f1a1.bin
6e28d3444dff7f2a3d878771de786dc1f1d022c79cf6cbef0b80dc29cd8bb1da
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 20500 bytes
font_02_sfnt_off000127da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127DA 16792 bytes