Malicious PDF — malware analysis report

Static analysis result for SHA-256 645088fea9f5eb34…

MALICIOUS

PDF

83.3 KB Created: 2021-06-25 12:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8356cf1fb2ad98931168665d1368b20c SHA-1: cbd4c7181c263710f09ae1c301f58b37396a04f8 SHA-256: 645088fea9f5eb3437152efebf30ae167c4719ace1f7b6f0b4cbc79bc6244a25
96 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous URLs that point to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the presence of multiple links to potentially compromised CMS upload directories suggests an attempt to distribute further malicious content or manipulate search engine results. No scripts were extracted, but the document's structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://drafthe.ru/uplcv?utm_term=marketing+management+by+ramaswamy+and+namakumari+pdf PDF link annotation
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a649966c04---66374527937.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/b447a95ed40403357b8b656935c4f859/kimolegijuzel.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/sebelimadozanababodavo.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/tivadabosewapilim.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eggp3kg7gch6a13mdeg6nn2sa5/jenovi.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078e259b9a21---90770090297.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a52047f1b---61321783881.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/2c6ca620d922ea7b22bdc8236f6202dd/fafesewemaz.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/54cc3243116c3709eaa12261e058ea3e/watogemiwupumuwofaw.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/30762739115.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/8afd7b768530a84db2e17f2b6de1851c/pisuloxafumeruminekuza.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080ad6a3ea0b---kixivelelozuxogexibuwo.pdfIn PDF document text
    • https://jetaime-shop.com/files/gakixewoxegekupojagi.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/966da0b546ba68113337a4954935c412/pogupazopubakun.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086db000b5a7---58142230476.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/15916837059.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9264514317---xofewanuwel.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/sezidamerorulajoza.pdfIn PDF document text
    • 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_off0000e036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE036 11200 bytes
SHA-256: 13d8dd2a644fcd73206e82455a9ba25a5ec8659423791cefdeeb6df196ac1f8f
font_01_sfnt_off0000fa12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA12 17460 bytes
SHA-256: 1a84ba72f309e6f73ba45d20988a8cbcb31d6c29559362e74175464ef77ab487
font_02_sfnt_off000127bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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