Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11e1da72255dffb…

MALICIOUS

PDF

83.7 KB Created: 2021-06-26 08:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c6085d4824bc1300225431ca65b9871 SHA-1: 634c7ef2515d8d8d20a36b69e78827b8a5a533ae SHA-256: b11e1da72255dffbf742ec34a712a7222f8c859aa8fa3c1c762c41b274ef4382
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, many of which host PDF files. The ML classifier strongly indicates maliciousness. The presence of a link farm on disposable hosting suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/be818a85e68dc69f0827673bb364f747/98072310482.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075247eccb0e---tunavuwelosam.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088801a7b2a4---punabojadam.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/poturimewupegewumedof.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607750355eab1---63845589624.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074fdd982476---zusejuzopafavezalum.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/f6442e4ec4f48969182594bd3002f874/bugezasezibajigir.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/7d2c4f6a543592f41939fe9516cc7e06/rebibono.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084279785ec2---99562768983.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/e6bd7982a7ac5a7df9b56107915f89c9/wivujagisagepuzevur.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/rsgt7sn1tul7j5m076dtsl9oq3/riwabumuputefigo.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ef593606c---punazop.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///20210514125640_798054681.pdf
    • http://www.findvoters.com/userfiles/file/87391418218.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/slff9jqvu4plar098sn698593g/bavipumatogosanopirige.pdf
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/lnh0t4g7jladiejd5106l5u6ds/12373644522.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d590e35fd4---72812471319.pdf
    • http://dermaktif.com/imgup/file/lewosumexuvamonisav.pdf
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/0bca2c417ec2402377398ff3f29d21b8/mekaperevuzinijapuw.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608de52c4f5d4---65434225734.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ca97d82a594---zorululuwuliwiduxigez.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e67608594d---99487747679.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/b39db2936be3a59cc72129e22992c70f/gebuxapogusamojutunufipe.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20f05ee986---2929257080.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/r9bep4khvpdro9tt805fp10n60/82134391352.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=rainbow+bee+eater+perth
    • 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_off0000e542.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE542 16792 bytes
font_01_sfnt_off0000fd54.bin
38719e3c478ae4b5b1445301f7710cf1c1137cdca6f80ce1fc5b097a35b4605c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 17484 bytes
font_02_sfnt_off00012a34.bin
5e47452a828e9e23d264961d705568651fb6ee18cb41619648aeb3fdde59a680		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A34 10408 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.