Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbfb3cf0d344d0be…

MALICIOUS

PDF

80.7 KB Created: 2021-07-07 14:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ef2a41c26555b5fce074427351669273 SHA-1: 2229eb5437f79320c59bc327e5d14213eeb9cfad SHA-256: cbfb3cf0d344d0be8d1188ed776c173162a9b3f2e97be98bde9f7c5cb421cc2e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed for SEO manipulation or phishing. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent. The embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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=example+of+bill+of+quantity+for+construction+pdf PDF link annotation
    • https://aashianarealty.com/file/repuwofoperasevukaximer.pdfIn PDF document text
    • https://digireg.se/upload/91889486722.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/41541bcea8019966b436ba8a604bd9de/28983702697.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/46b9d47c62525a33f4718e03479de111/51440741401.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/fibajeniz.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/49160068586.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/90794658802.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/cnjuvmevgbgfaoncc7chvdbtv1/jowofojugimafuvizopi.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/98386d09cba1b89970d7432c45770d8b/fugolowe.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/xolid.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076c75cde32e---64342134886.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/f4cf5787a33491175f71a757b134ef19/3898451156.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/bc935da02befd8e59aca6b5a560a9824/6788087577.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/pudigapaxufu.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16095393157440---domofobasovi.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/subugarumatagofofidezidop.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/1c280016201899923a2c62430881dc03/ketatodekop.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/3516083955.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608146403d8a8---birivogexegopus.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa386cd716---juninazul.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/3768454f556c57e35a81e7d1c44e9e46/dojap.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/4636bbed0f003ce938df782fc4e6bab6/4703397676.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/70e2b4afae00a2d83849abd01d519d3f/36534032957.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 18124 bytes
SHA-256: 542006dd5359e5c53368a9f9e3cb2609dd8fa06629086d30ac922256dd077865
font_01_sfnt_off000120bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1