Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd889030a4dacd99…

MALICIOUS

PDF

85.2 KB Created: 2021-07-17 22:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd161bd7b965a9586a690779f2259da4 SHA-1: a71b0bbd485ddde2bc78eeca9220d2353939e772 SHA-256: bd889030a4dacd99b393039aa0370f6d7d06b68a48abe8c1d4f2ce8875a8de4a
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs pointing to various domains, many of which appear to be hosted on compromised CMS upload directories. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this is a link farm designed to direct users to external sites. No scripts were extracted, but the structure and URL distribution are indicative of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://usaoxin.com/userfiles/2021-5/file/39726884597.pdf In PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/52c296cb1cd7b3f54ab0b66b426534dd/tuxiri.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/53414a5955947eef2b731f42de684b37/tekufozejowedetijovevusam.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/k2v99npaaombrr3fmb6r1cu6r9/vewojiwolixaxifumelus.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/faefe290ed2c62ea35b0d8b8dcb7dad1/47646654716.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/vibegobakuxibugogopo.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9e12d31ca---21443811258.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/754e9e15115a6357206d8aabea869be9/jivegaliwawoxitekajoduwig.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/e96067a5fb76690dde25dc44cab496f9/78329783201.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/jibunu.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/90244081132.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/dad06b4b158a279eb4a9f5a8ceb73538/6761552913.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dace967d9---vopabigugeluvad.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086e5fc969b4---fobuvesamug.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/07630e981c10cb370e6d40379f70d197/49508863367.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/33076351967.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/42541458851.pdfIn PDF document text
    • http://mobiliteit.nu/files/68359776172.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-8/20210508081220215608.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160eddfc9a9279---sevaj.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/68054127382.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/65109729312.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/amof133i86lm91qbtn16t5d4pj/72207501669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=air+fried+chicken+wings+caloriesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAC 17084 bytes
SHA-256: 4c07ee3ac04f92ca33f049a1781a14ecb8932225c71b60cb57a5778b9b1db5df
font_01_sfnt_off00011714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11714 10816 bytes
SHA-256: 5dfa70b9c6014d3c62722d34cc238c74eddf7a09b81ca7bc9d67164db106de7f
font_02_sfnt_off00012fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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