Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a2597f372b2ad4…

MALICIOUS

PDF

77.3 KB Created: 2021-09-13 12:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3b81f4f471ae5d64ce65070a8985fe4d SHA-1: 216f9d0d815590b2171e9f4ff78ffbc2d6320876 SHA-256: 36a2597f372b2ad4e320cf13d8aac3ceea2701171a1186a050518cc19068381f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the presence of many external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393860c3661---luximewu.pdf In PDF document text
    • http://sobateracota.ro/mm/file/28303809986.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613766ae7948a---nulowopakedupemefob.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/29007909793.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/nepilibufivojirisipon.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/zafamarifiwovek.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/65673448241.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/wojitusemawupedimuwepo.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/81666338402.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/fafuguvazefenimoxojor.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/66310016081.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/29018591477.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/vufodelof.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/93606355744.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/64811793621.pdfIn PDF document text
    • https://satesayap.com/contents/files/kekabipuwikewovotivodaw.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/30382149606.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/3c229a30808e73003eea69e7ad15f215/dimonav.pdfIn PDF document text
    • https://arendic.cl/files/40621292018.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/47273573935.pdfIn PDF document text
    • http://all-premium.com/user_file/files/62110844466.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/88778979425.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/mofatamogopebofi.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/49076938488.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/96430764236.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/76384608801.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/40888842963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=osi+layers+and+its+protocolsPDF 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_off0000cba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BA 10648 bytes
SHA-256: 2d8a6d0baace8aa9f02eaeb10d625badefc058e97c6e54f009f63f9c37ad061e
font_02_sfnt_off0000fc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC38 16956 bytes
SHA-256: 43af0f2a231c1e7e41da319cd99b4f749333b5bf59c2c296ebeb59a60f6683fb

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