Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf27071724e6efc…

MALICIOUS

PDF

109.5 KB Created: 2021-09-06 13:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e2f62abe18b1bb96dccbb6e52e108c6c SHA-1: 49611a9cb314d895a7b33ac4bcffe5162b06f39f SHA-256: 8bf27071724e6efcf5b68c62023d528083c45304ecdc2136c394ac106d7195f6
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 ML classifiers and ClamAV, indicating it likely contains malicious content. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious or phishing content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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://ms2gacor.com/contents/files/demokamitagawaleliforu.pdf In PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe57ec4e3c1708e8f049e1fcfce566e5/sezibimidinavulu.pdfIn PDF document text
    • http://secretinvitation.net/images/files/meroretufufupesabo.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6621e31a3---92440605380.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/60797997966.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa447264d1308794572f111d8d88de6f/xuwobekujoguzuwaveji.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/23245555643.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791ad29008b---gedutuximuf.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e583977fdb9b6191a325a24fa35cbdea/felupuwidavakexuna.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/82536490121.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d42079c6ad1---50884893893.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/refafokizup.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/kotigejisuwugavesafa.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160869fbb3a949---pavanaweros.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/lanedaw.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/goxefewufulita.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/wexuka.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/zebalugofesof.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/negewuzumipuze.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073acdfc1281---30414934146.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/vapaf.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e685cd83409---vatuvu.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160de5ea7075c9---rekewazokoboz.pdfIn PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/dolazifosumop.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c27bd79e93345d7c08cb4f1653a0d43d/vimipozawap.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0848e443312be3c01e657326cf2528bc/6259111743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=calculating+texas+holdem+poker+odds+made+easy+pdfPDF link annotation
    • 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_off0001400c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400C 19472 bytes
SHA-256: 1783edd30334a8085e9357506ec4379eb4acb8746b4268f1376e6de44787949c
font_01_sfnt_off000172c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172C2 11504 bytes
SHA-256: 06ba335becf3788823fe6b1c72fd24ac2c0b19f8fff6c4100bb5f37effc86b2a
font_02_sfnt_off00018da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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