Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc34ef3ed055ed9…

MALICIOUS

PDF

72.6 KB Created: 2021-09-24 17:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b9b6e0532748e88c018a8a7c4a9f3948 SHA-1: 73ede60bed47b6642016b6fd3710b0aa730993f0 SHA-256: ebc34ef3ed055ed98cb36be019fe7139432e9d488611e127af1deff1a6ff6469
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting an attempt to obscure the final destination. The presence of embedded URLs and the nature of the heuristics indicate this document is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://suphammamnon.org/uploads/files/44833054357.pdf In PDF document text
    • https://indobaliart.com/sitefiles/file/20294962687.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109092045136386.pdfIn PDF document text
    • http://mlight.cz/archiv/file/37928510895.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/94495201198.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/sebagidiguwawegefuvoz.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16146285b7f370---bunagusafubin.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/8cdc71294f46e266e349162a5ee87fd4/60627775425.pdfIn PDF document text
    • http://pilatesmystyle.com/userfiles/files/80249910101.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/25edb1ba846efce57613b450b7b169ad/vewojirifibo.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/56991310675.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/98982144506.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/funibo.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/lebufilodena.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/gazevija.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021090809163973499.pdfIn PDF document text
    • https://rintrans.com/files/livoladewon.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/nirev.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/ca2213db449c21214b688f3da21650fc/tazosiv.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/sijadisumixogof.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/dodinetusoxi.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161461c9fe1055---tizajibakifegotabina.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/64768025161372b84e88f3.pdfIn PDF document text
    • http://philboyd.com/denuzejamifufoxopanuku.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/foxikixexureke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=multi+account+parallel+appPDF 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_off0000b981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB981 10292 bytes
SHA-256: 730db5e04bbd54106ac66f9a3efd559012d6f9901390594020ec846f54225b3c
font_01_sfnt_off0000d0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C9 17204 bytes
SHA-256: 3d12455d469f3dcc4172541f4eacb9191ac2754db50ab659f04f00b3efc7979e
font_02_sfnt_off0000fcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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