Malicious PDF — malware analysis report

Static analysis result for SHA-256 0931e801d28caca5…

MALICIOUS

PDF

72.9 KB Created: 2021-09-03 14:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8588649d9f134ad89338f05f865ccdf3 SHA-1: 8121510b5b9293e1385f04c64557424e4ccf6ef9 SHA-256: 0931e801d28caca5363e5527558f4eeae4d0ff382d045a5d75774d49ae15a8d5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites. These sites host further PDF files, suggesting a multi-stage attack or a phishing campaign designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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 https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160c68d8da8541---fanep.pdf In PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9715f94556a689cfc84959c788329924/70709674595.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/73387500904.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/9617cd244f236069cd9e29ebea400bd5/77504296858.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/78982334690.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607da996124c1---90788071446.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210814_59EE70124CC290EF.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/47611493169.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a58d9147c---76818195099.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210804135458.pdfIn PDF document text
    • http://abroadster.com/files/8515708905.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/9534731929.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/famasemewupugawibek.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/81927614132.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd4592be09---dezerezewabe.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/8d260ed6a55e66eaf979d1e542225020/76550231273.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/mesasur.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/61463426479.pdfIn PDF document text
    • https://thehouseproduction.net/file/38719785463.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/teliwutaguxulekok.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d859c17640---nabelatibas.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/sixigoto.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/01edf41bd8222aa5fe20a72a0fa7feaa/wusexejeratox.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/42216954161.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160818580b3054---faduw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=worksheets+for+grade+3+fractionsPDF 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_off0000b923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD135 16812 bytes
SHA-256: 170246371f64190d696a052cc3b5367555a870db31b458fa3d67b8f9aeb51440
font_02_sfnt_off0000fc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5F 10968 bytes
SHA-256: 94afa0825875e203ca5736c5e90d833a94cfe0db7aec340152430d7c23ddd45f

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