Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23d19b27f28b9c5…

MALICIOUS

PDF

93.7 KB Created: 2021-08-10 11:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8a4b06e4721eb13229989d9817ebfd8 SHA-1: ff6be6fbb7761f78a90ca757d65c22183a5cf1ec SHA-256: d23d19b27f28b9c5c6ecf1d701542ffe132fb50f226248627dc6ee79385936c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the link farm structure suggest this document is designed to redirect users to potentially malicious or phishing content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3ad0b6302---nukalaluzazu.pdf
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dinadegidojo.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829bde56474---dumajikupalagomiparajowog.pdf
    • https://soccerauquebec.com/userfiles/file/96608302132.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/l09da2qkg8lr08so6nhfisu82a/xigida.pdf
    • https://feniks9.ru/ckfinder/userfiles/files/92931893387.pdf
    • http://hutbephottaihaiphong24h.com/upload/files/14320023477.pdf
    • https://debcopharma.com/userfiles/file/63174407859.pdf
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/musufopugofidetonal.pdf
    • http://alumnicollegedelunion.org/clients/76066/File/dufumorufijivelanalemu.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/38377bcba39c0ce82e5abc02c85358c4/banijiguw.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/74jvvsutl2tsaipl0b6e7vg13e/85689094436.pdf
    • https://lesfeesdelhetre.fr/upload/files/medibuwagope.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a14a8031115---17876064750.pdf
    • http://www.moyekolodin.com/files/furanawuzopezotejole.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b328d42b89---bazibilozamegezotu.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608591b40ba8b---xibosudevezusegol.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3c7abecde---galiveduxenimexofokelibim.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c9a5a8f4c---kolimome.pdf
    • http://ranahytta.com/ckfinder/userfiles/files/nefimojelonux.pdf
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/riborobapikodavoxodenex.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=codigos+para+tener+diamantes+gratis+en+free+fire+2020
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc85884e14---ratewidonadoxowixipam.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f033.bin
e029a609e90c5a3183b64399ba374b5c4f2aea8e806550aa8fb6318571d95750
pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 11068 bytes
font_01_sfnt_off000109d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109D8 16792 bytes
font_02_sfnt_off000121ea.bin
c0a69fc38f766c117c81d527bf795b91451a6462fe4a495231766f43744bb871
pdf-font-stream PDF embedded font (sfnt) at offset 0x121EA 18260 bytes
font_03_sfnt_off0001500c.bin
19fb3e0837d6f9ee728c5331d7bb33e1bff3d595bd4ca4a0aae7833d7d421d60
pdf-font-stream PDF embedded font (sfnt) at offset 0x1500C 16120 bytes