Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e3d4eb6508c8afd…

MALICIOUS

PDF

88.4 KB Created: 2021-08-10 00:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1aa9b54196b933adc7646008ac68ae15 SHA-1: 8d745694f49c77a45015a60e8b75a8385a86163e SHA-256: 9e3d4eb6508c8afd76ab554ba8ff527268b15dd6c8f45bbcb8fce35267cbed03
96 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to compromised websites. The ML classifier strongly indicates maliciousness, and the heuristics suggest the document is designed to leverage compromised CMS uploads for hosting content. The primary purpose appears to be SEO manipulation or redirecting users to potentially malicious second-stage content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca8d6ee605---57226350619.pdf
    • http://alnadaoil.com/userfiles/file/paxitamolalipuduxanifobul.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610314000feee---botativanagunatoxuvipapi.pdf
    • http://cerrutistudio.eu/userfiles/files/40200854757.pdf
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/64204924569.pdf
    • http://korsorlampang.net/user_img/files/togolonik.pdf
    • http://www.heksan.com.pl/file/girufozipi.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083f9ae02e52---468064457.pdf
    • http://ajivikafinance.com/userfiles/file/57018267598.pdf
    • https://btsis.com/upload/ckfinder/files/peruvubamopejezaroxipix.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/69548785651.pdf
    • http://feach.ie/images/uploads/file/mukov.pdf
    • http://pantryscan.com/123cars/imagefck/file/zulepezawalixifixilufisa.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8d76ef9e9---sorozosipowenanagofuniwe.pdf
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/zimokusunasurizukajojig.pdf
    • http://agapetown.net/ckfinder/userfiles/files/80343446585.pdf
    • http://pagyesa.org/userfiles/file/20210628212713.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6345f194c---19175263125.pdf
    • https://consurs.ro/ckfinder/userfiles/files/kemebufuvikovatenojegij.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/4ae3151cd7dcbb887bc4c8c13cf41490/73417127429.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/1e4d47b5fe6637a2f17f7e45c0b2e56c/10092907820.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/rrv96vfo5kebv2n8tdqb2eil0e/nuluparevutu.pdf
    • http://market-oborudovanie.ru/upload/file/9968312365.pdf
    • https://emprenderem.cl/files/gikegebupenemujoxo.pdf
    • https://mmagame.com/userfiles/file/polobavapew.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=alfabeto+grande+colorido+para+imprimir
    • 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_off0000f3cb.bin
71b3fccd8b679cbe21d551363306e555538423a6e62ab633ff7766303d16c917
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 10916 bytes
font_01_sfnt_off00010ca3.bin
a1e4ca3fefa3e663a8ebff8e3e844b4c9dc549c5bc4d3064e84321870a41fbf3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA3 18104 bytes
font_02_sfnt_off00013938.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13938 16792 bytes