Malicious PDF — malware analysis report

Static analysis result for SHA-256 57657f1239fa268c…

MALICIOUS

PDF

85.0 KB Created: 2021-09-19 06:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9b7ff50acaf67c758a322d30a29db21e SHA-1: a99bef1aa1add7c1f03c01499f8cb1cb86681418 SHA-256: 57657f1239fa268cb2e993fd01bc10cdb0aceaad5a8294315917c810f09669c3
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV detection strongly indicate maliciousness. The heuristics reveal a link farm and QR code lure, common tactics for phishing or malware distribution. The 'Password-protected archive handoff' heuristic suggests the document is designed to trick the user into providing a password for a subsequent payload, likely delivered via one of the extracted URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://scvumaichiramen.com/uploads/files/woganadosiregivog.pdf In PDF document text
    • http://softtox.pl/new/userfiles/file/97937783674.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/14648629167.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e9b53feba---18915377905.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/83qq6vab1hbthl7j9gen9r5ajo/rujelusofupi.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/85748488794.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146530cb1b39---nufef.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/lemigebabovopuv.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/bijepuw.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16130dce5ee9c3---gujivetodunafobalom.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/waxugug.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/vodaroratogo.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/88091507481.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/12588740441.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/xakajovizet.pdfIn PDF document text
    • http://uchid.com/uploads/file/25352522077.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/zobetedazejuxozipenizaf.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/nojebugovazu.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/kikitukabinisefukonitor.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021972115188655.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/betipozerixasipidarikex.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/xubidaguf.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/fevawajixumuref.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef2d4c7624---defurijasatuvoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=read+qr+from+photoPDF 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_off0000e83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83E 10544 bytes
SHA-256: 396538b3a9e7ce0edbe702ae9b2423ca9a63a347e43b770b447104e746fc6325
font_01_sfnt_off00010006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11818 18044 bytes
SHA-256: 9420107eaf9ea3df0e0b25882d8306ac538425e6bc65a69bb8318c56a4a04e5c

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