Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf225d5b6027d33…

MALICIOUS

PDF

71.4 KB Created: 2021-09-29 11:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd5d6ec66393cf65d75a9f6b5a7fcd7d SHA-1: 672ad122ff758e29fc0eaa40031c409136c2ca24 SHA-256: 6bf225d5b6027d33dcaf4da17c0167177b22b0543054dd32f1e0be008da74d82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The presence of 'utm_term' in one URL suggests a potential phishing or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a structure common in malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=csr2+racing+hack+apk PDF link annotation
    • http://sino-web.net/filespath/files/20210915142027.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/bazomilozexirepuk.pdfIn PDF document text
    • http://asid.rw/userfiles/file/72685482.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/83022388784.pdfIn PDF document text
    • http://synphabase.ch/upload/file/kikalabo.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/jajafonomatesojoduz.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/tinowamifogiwitazajek.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/dojusiwapunowevebulemer.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614172ddd01bc---bubesududizorizarotobukop.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/xibekanojamabosebofut.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/fivufadegasog.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/14959536735.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/nimejitorasiwajiguseliw.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/56690737594.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/losivobobosuwakonovoni.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/setemi.pdfIn PDF document text
    • http://wernitznigg.at/files/kefiripafubivib.pdfIn PDF document text
    • http://moristas.com/userfiles/files/3828826118.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/mibixema.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f5d42a9191---38616298123.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/27821948780.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/fc7d5ba56148e65f6bb8cc433e2db458/74568365841.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/15q2jdj6tfq943fmrtdjhpcdhb/guxuzofelabilim.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_off0000b0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EB 10500 bytes
SHA-256: 1c18e48a6ff8061f8dc8e0f1b094569231928fc298c301e657305bace9b95710
font_01_sfnt_off0000c8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C3 17884 bytes
SHA-256: a97c49ea92d0fb8de71b9e11a4097400078164445e35428f62ef25e583dc88e5
font_02_sfnt_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.