Malicious PDF — malware analysis report

Static analysis result for SHA-256 0addf8aa7c7bd7a6…

MALICIOUS

PDF

106.5 KB Created: 2021-06-16 04:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb3dc085b91282493ec40cf651b47a7d SHA-1: 80acee866b1070f68a41969cbb69014f63fc1c1c SHA-256: 0addf8aa7c7bd7a66cffd487bc67f60847f7fdfbc878985fe9849d8182f7900b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm likely used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://chcial.ru/uplcv?utm_term=object+and+reflexive+pronouns+exercises
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/34714184871.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b49846e800c---44200740694.pdf
    • http://kinocosmik.ru/sadm_files/68991476399.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cded1e1d1b---zamadote.pdf
    • https://altonika.pro/files/fck/file/45824758012.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f2d95044d---kudinizutajiwatude.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098572ae2d3d---xakamibajegeribepopidum.pdf
    • http://kapsalonindex.nl/images/uploads/soniveralugojesiba.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f7473e892---72506762749.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/75d23a707170e8bd1a23d16fa5750055/lozarapopaximebe.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbe4c52798---38878268153.pdf
    • http://ytbozhuo.com/upload/file/031019499254.pdf
    • https://dm288.rs/slicice/file/navakukuxodumob.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609234d9181de---rajujopo.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0f74c1baf---76476610841.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/55e96e3fe5759cf5db3727160fa35a82/63678641108.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015cb0.bin
a06f2bdea69c4ead25bdad712fe8d8fbe7bd6f6c2d53de4971a9dd5e20daa637		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15CB0 5520 bytes
font_01_sfnt_off00016f86.bin
16733019a1a2c911d54b09ae1ffa9701c95e4dcba3651eac882aa05d49079721		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16F86 14192 bytes

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