Malicious PDF — malware analysis report

Static analysis result for SHA-256 12fa5662eec5c1a8…

MALICIOUS

PDF

86.9 KB Created: 2021-07-02 12:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 114464c1742b9d8987c8592a4dd7805e SHA-1: 7d8cca9d3a90a6f624d99c089e12ab6621fcee67 SHA-256: 12fa5662eec5c1a8a47e565b3ad777cb775e977c061328ff3fa973f001cd882f
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link T1203 Exploitation for Client Execution

The ML classifier and brand impersonation heuristics strongly indicate a credential phishing attempt targeting Facebook users. The document contains numerous links, including one pointing to `https://cructi.ru/uplcv?utm_term=free+robux+gift+code`, which is likely the malicious landing page. The PDF structure and embedded links suggest it's designed to exploit vulnerabilities or trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://cructi.ru/uplcv?utm_term=free+robux+gift+code.
  • 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://cructi.ru/uplcv?utm_term=free+robux+gift+code PDF link annotation
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942bb66265c---83834124684.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f7795f62c---pesunagexifazo.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/nirumunexatogokakobilagok.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/tovopeponugituk.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/kiwapuziposerojarowojuleb.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/71161939852.pdfIn PDF document text
    • https://arerp.kr/data/file///bumilikagamagonuwufaz.pdfIn PDF document text
    • http://scro.ru/pic/file/48947844489.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d060d995cf1---21548613313.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091276865ada---fokebax.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da162cf595---gokulizosebug.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/95266575220.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/b2588d770b441204f55cbaa024828718/42522913807.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/24615463124.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860af96dabc---99940883386.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b364a05024c---59458249117.pdfIn PDF document text
    • http://954move.com/clients/4890/File/seritar.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fffcdd2e1e---40839649587.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160906c4e13f4a---susuluzizujulipugadab.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/e54535f89ab4469fec35850006bd1b75/voguxe.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b249b86a199---90033543556.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e80805da455a816cde0e910cb5f40086/linigazupukizelekibup.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/mebixozozu.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae957ae12a---93486321691.pdfIn PDF document text
    • https://topupdana.com/contents//files/66428037649.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_off0000ef20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10732 17896 bytes
SHA-256: ad0d49bf1727b46754a575e14efb8719280a4cff25776f90650559bd3c9772b6
font_02_sfnt_off00013647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13647 10488 bytes
SHA-256: d2410b8cb2fdb57aa9677a6a682d56b559e80b3e6b01839e0f58b2c0bee364a4

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