Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdcc7b80c2df5000…

MALICIOUS

PDF

92.9 KB Created: 2021-08-20 20:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f51b2fb3441128265fb194d20af11aa9 SHA-1: 85161c92e32855c6c16d9221fedfeb8908c6aee3 SHA-256: cdcc7b80c2df5000ef37bdedaec6da73aae0d2e209c46a1bed03e935851b17b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The primary attack pattern involves luring users to click on these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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
  • 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://catamma.ru/uplcv?utm_term=modelo+de+acta+constitutiva+de+asociacion+civil+en+venezuela PDF link annotation
    • http://waterlootour.com/FileData/ckfinder/files/20210815_C223C4A89EAC8CCF.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab0be1bae---defuzuxazaxazokid.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/15977039278.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160722330810bb---pogiborawitufodu.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/80116572078.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/67411940968.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/gijivi.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/82905985149.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/48789916658.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/63400587635.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/niwixiribixovaka.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/nogonedifelodelemapaxape.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/33c3e04a151089debe0dca7cfbf823ed/radiretumitosuxit.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/75551495111.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882ed77829d---xezisigej.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107cf3f130d6---59497170004.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607737e5ec0d9---17187881215.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/gazajuzewakafonepam.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f96b4068c---81783723284.pdfIn PDF document text
    • https://coil.hk/upload/files/85650605264.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/nonagele.pdfIn PDF document text
    • http://janyska.home.pl/_mjanyska2013/fotki/file/62307646585.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_off0001043a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043A 18172 bytes
SHA-256: 4d9f46b7c690b5029445992b96e60c2e84d5626a353b9063c54bbe4b217931a3
font_01_sfnt_off00013294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AAB 10484 bytes
SHA-256: 46f7236df43c2c32e97e10c1235548e8b04e51ca16ab7cfcf572268435fbaca1

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