Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b483df522fa826…

MALICIOUS

PDF

71.6 KB Created: 2021-09-02 19:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d49947b615b71c47673e7329f110f9ca SHA-1: d651dfa903da357a6ba695ee180f7daf2070aece SHA-256: 70b483df522fa826fe00b222432f93c530160cc336003cc31d32ccaf506357d3
156 Risk Score

Malware Insights

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

The sample is a PDF document identified by ClamAV as a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised CMS platforms, designed to redirect users to potentially malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kultmotor.hu/images/files/81212526436.pdf In PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/6fd15bbb58caccdb72ffee4abaa9c0a9/kepoxelapomamugivivug.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/1dg4pp9tb419eu9e14195sasqk/32056972248.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210528_19FD23FBFD80D25F.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/nipawifarisiguxuf.pdfIn PDF document text
    • http://saktigroup.in/uploads/rigun.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/he9l8198d57ptcvke4g9esqbt2/57306069881.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f1f6a3ee5---nafibi.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160714e4150cc2---92037248523.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/gopefedilowugufezowekovad.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1610a5581e33da---mujodotodugifuwuta.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f293e1afba---jaxik.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/31417821787.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/loxofurowobimixus.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/konazasaxukuge.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1b3bdec6b---xosup.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2b401bd5c---gomagakinabazebi.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160869b2b54d13---19716150786.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/24566470253.pdfIn PDF document text
    • https://giasusinhvien.net/upload/files/xozapafizipebiv.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/9a383ac3c39b568c251613a40cccdc87/bopavuxenumidomofotupuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=dometic+refrigerator+diagnostic+service+manualPDF 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_off0000b6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EC 15756 bytes
SHA-256: 2b6bd606d2f98f034b570394374b7d88151fb56d24a9167e02bb219d61382254
font_01_sfnt_off0000df63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 10984 bytes
SHA-256: 0b27f013ed9ef1a3b21bd25bc3c796a7515dcd8adc9e7825388e14fc5c88580d
font_02_sfnt_off0000f8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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