Malicious PDF — malware analysis report

Static analysis result for SHA-256 128a2ad62a8b0089…

MALICIOUS

PDF

89.7 KB Created: 2021-06-28 12:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 287563552838732a9b69690610841ad9 SHA-1: 7f30b4a15f9498ef1e6b191c2055a53407b7bb6e SHA-256: 128a2ad62a8b00897594234bcdb03e4c52332d8b33d3d2266428dad7c896a1de
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure as a link farm is designed to lure users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://afayl.com/userfiles/file/gazase.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8035fe74d7---83473506113.pdf
    • http://shinies.ru/img/lib/file/luzopo.pdf
    • http://tischlerei-schlusche.de/sites/default/files/file/boxagakezurutuletorume.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85d57cbab8---14174113008.pdf
    • http://adamlegal.com/userfiles/file/timuza.pdf
    • https://egyiksem.hu/uploads/file/zajirufizujox.pdf
    • http://bright-mineral.com/uploadfile/file/2021062523252328.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/bf7e819e9b4887edfbd6809facd64ce4/33941213159.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8d7073677---93814430099.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e0135e33a---begetejepoxoliwalikepi.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/a4ec19904fa5096055a186dfd69c55cf/fidedux.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/fec84016e5557a8cc87d9806d8aa8815/runodukelamawulun.pdf
    • http://wintec-samu.hu/uploads/files/30219096592.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4486f0efbd---8188898671.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcd83b70e7---mobakotok.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c4387e1b---zabebamume.pdf
    • https://amd-export.com/site/upload/file/33679567995.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/e0d91481c72a9b120642af782048541e/92076234496.pdf
    • http://izeninfo.net/admin/upload/files/farupelobizowe.pdf
    • http://thermogroup.ru/uploads/files/61510229937.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af79127d9a8---67008833696.pdf
    • http://southport1969.com/clients/861680/File/kozirufarojiju.pdf
    • https://tavio.ru/files/file/29089451694.pdf
    • http://cmtsport.com/pliki/93608683035.pdf
    • https://abugfreemind.com/userfiles/file/biwamabebavazabarawo.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/24c53d9192788574f7c21c3a566853ef/notipuroje.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=latex+to+word+equation+online
    • 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_off0000e463.bin
af31cab08bbd9c3282df9870ddf64302913ec39ea98bc8bc9970dafa46ab0fb8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE463 16080 bytes
font_01_sfnt_off0000f98f.bin
57d6c8974f147d3d6463750e39a4388f502340822d16d0ffacd74939acb7d99a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 17952 bytes
font_02_sfnt_off00012944.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12944 16792 bytes
font_03_sfnt_off0001415b.bin
ff071b978d314697d11f9b206682a03195fcec4d11044574c06e04b67d1b2386
pdf-font-stream PDF embedded font (sfnt) at offset 0x1415B 10464 bytes