Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5fbbcaf8ead226d…

MALICIOUS

PDF

111.8 KB Created: 2021-06-28 00:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1bdc55c9172dc34872dfa696dfae6ec6 SHA-1: bc57c4d8ea5783a7bd920c73e1646b57b55a857c SHA-256: a5fbbcaf8ead226db40d144de033b321d86f7a00a9da69ff6cf0255f24c47d80
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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 http://www.aluvascientific.com/UserFiles/file/56990759622.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f117bf14c1---sixogedokifiduwetotemu.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/gfqvmn6ekks8baf6h109h4f4h7/lofisokirasoragadurotor.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e11a578ac---wikunubu.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c098be4667---68568769921.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830ed925fc1---gagiruzaderitumediw.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/ugshe5j3g78b5cskd794r7smfd/90444453454.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954eb69800e.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608870df96dcf---75898704642.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77797c943---79035747340.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b663502e49---79824645837.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a375b525250---vawarivijodetewuzunalikun.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850a7cc47b0---10702302804.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835773c5c4d---roxuvono.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/tufe0rldpsc6kj18ir420th28o/delagifogokoseseforodadaz.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160befb6bbc759---lufidepoxagiju.pdf
    • https://ivanda-commerce.hr/userfiles/file/fatesejiridumoluwa.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/t37t5ppd0f7i7b4fhtv498ikl1/buwemiremigoge.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a796f5cf59a---dujunidasulopavixibuvosug.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/bb4bc71d667c8256110b683dabac0bd0/nevikukakik.pdf
    • http://hungbuloon.com/media/ftp/file/40834577646.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d05943a737---gupidudorotas.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608143f870a23---58046270308.pdf
    • http://technoculture.cz/admin/upload/file/gufisatolijowe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=a+drop+in+the+ocean+meaning
    • 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_off0000ee5d.bin
c85f20c049df3fc9fa2b16fa03a7a9cc8a58e0a75aa94b96a94ad683ca01291c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5D 33372 bytes
font_01_sfnt_off00014ab0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB0 16792 bytes
font_02_sfnt_off000162c2.bin
5456e4e664052cc97cec88b642a469b52a1ea4ef7be6aec1c7afada3cc9f8cfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x162C2 21832 bytes
font_03_sfnt_off000198ef.bin
1ea3927f5f83f2cff6034d8651c47a8603008010a97654f7de58cd4218c298bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x198EF 10728 bytes

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