Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d20c7a2565356b…

MALICIOUS

PDF

78.0 KB Created: 2021-09-05 05:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4220722b584cf5c2d6680ce6ecac0469 SHA-1: 9df61744619a0cd6c84e43f89449e70a43a1e2c2 SHA-256: 40d20c7a2565356b28c2ec1dda1a002d113b5a9c5a049af5626b75e2f5300a84
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting it acts as a lure to redirect users to potentially harmful sites. The presence of external URI links and compromised CMS upload links strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://oniceh.ru/uplcv?utm_term=montego+bay+convention+pdf PDF link annotation
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fba61d2e3e0---gepojarif.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607ece8580182---62895713400.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132c0215e4de---felatelixixed.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/gemgf8jtqo2sicgv8um9m1i6ib/lorisuvotukis.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/teguk.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/redujezogixabus.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/pezobavejelorasu.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/muxerivakoguvafilemofer.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/22809235602.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/rexidamazo.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/zanozed.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/lavexutiki.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/30393339918.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/23387371561.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/28400545886.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/vajubusaxivovizipo.pdfIn PDF document text
    • http://talleresjpg.es/img/file/setomofepin.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/29233215924.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/kawilizot.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b060fb36256---bazinugewagekodabeteluxi.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/71026444059.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/36183171132.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/34711871250.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/bubamosewerukakabupis.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/wusarolisibapalanexikazi.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/67c2425a81ee817a27e962d2e9bb1366/32083662034.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_off0000cc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7D 17332 bytes
SHA-256: b332c858d2a739034829210f7e39c131d99638c721783eb0b212672e1ae848f1
font_01_sfnt_off0000f9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D0 10792 bytes
SHA-256: 37bc86b3546496ecd8b9a0bf56df55ebb00c69b5244249eb6ef6bb2fde373aed
font_02_sfnt_off0001127d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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