Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ca31771259ebc5…

MALICIOUS

PDF

85.9 KB Created: 2021-07-03 01:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 237799dcf625d6c82f55037178c70a5e SHA-1: 8f529906788241e68596b57c9a88e053b911687a SHA-256: 26ca31771259ebc53c7dbf3ca10c2e44d324c74b3a3c3e2646cbeac6178464cb
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, likely intended to host and distribute malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution scheme. The embedded URLs suggest the document's primary purpose is to lure users to external resources that likely host further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729d96d09d4---fonalog.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098781a9a10a---referelivedojumitaber.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/e98e8e387064d9f09c79ae6c45bb9de2/51421081920.pdf
    • http://birkhoffhi.com/userfiles/files/1667564792.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/bf352911915504eab3eb6371e1ec0deb/bumoxaponetopunowidetatev.pdf
    • https://bandotrading.it/uploads/file/gararilu.pdf
    • http://dmhu.eu/uploads/uplib/file/37712709193.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160df8a3a8ab9a---93961882030.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a7cf54e6488c00131edb5fa17a345641/zokadusafiwebifomegekaxu.pdf
    • http://gourmethousemacau.com/UploadFilesfile///gexijamokomilopose.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fcc44191b---xawiduveleg.pdf
    • http://www.cerathai.com/image/upload/File/93116605556.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29414d8a36---71526610157.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/5ojba9a6givsb351v0f803oit4/25943605746.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e0d127ce3---79232869778.pdf
    • http://nyett.hk/uploads/news/files/rawonin.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/8a77ab090c67980cd4bcfa413c2a2674/mawoxokidemi.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a5cc71c81---9871572530.pdf
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/23424271957.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b293ea2fc---likifewolesi.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76f0bc7539---86612378538.pdf
    • http://buergerforum-tirol.at/file/betoferemozazobiluruwax.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac0864ccc0---92201986073.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d480596ef1---digukatinuna.pdf
    • http://shipagents.nl/uploadfiles/file/pokoxox.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=merge+of+pdf+files+into+one
    • 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_off0000ec1f.bin
14f2a4e403aad300bb4fa9d727593c20557b779e2432f850e112923aab452502		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1F 17256 bytes
font_01_sfnt_off00011935.bin
964a8bf8b74a66d78b3cfeeb131d178453c1cc2b93e4c288bfb19b86feb216ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11935 10504 bytes
font_02_sfnt_off000130f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130F4 16792 bytes

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