Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f22a92c08bfe174…

MALICIOUS

PDF

78.8 KB Created: 2021-08-28 11:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 708bf7005eeb062b2702aa6f925773de SHA-1: 32ce9172856773c15e5e7995dd0fb6bf40b7fbf7 SHA-256: 8f22a92c08bfe1747078c61ecb653324c4ee804ebb0e67813ccc59de4f5f7451
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/963v1bap7gqa6n13bbsr7gj1v1/93554336178.pdf In PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/2c8f634484b6bdec0ebd926f9dd5f8d0/90738184202.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/334f690b77fef5f5a548da7ce74f3b06/xamunala.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/j5fudgo5glqpearoq9jjqr1mch/tizerupiwutowajosategof.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/63377100105.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/zivetum.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/asgc8agsp8tkee987la7m4kioi/78699550760.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/gatowa.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/536d923b55c8be81a634e44bf35249d4/jiloguveki.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/0ecbbdc91a59eb4baa4c2df1dc378177/buzugilifajepakuki.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/63ca26485a871cb13052438fc1655c57/83497549103.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/timt0obqufbmhj5pceo8691s5a/6039130156.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/30460692739.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/e66b0b3036515df781d566ac87ed8b16/12544320189.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/b6cccfc9a92440e065cf2499c73a0e71/88306374340.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e215b6774bf---48598984253.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/gedisavoboxuvipowugo.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/salod.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/simidulexeru.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/g7g9vknhdcig5hqhpv7qbi09i7/sazisedazugoxuzagal.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202107file/2021070506520070554.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efbfc59638---87963172767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+download+multiple+pdfs+at+oncePDF 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_off0000cf46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF46 10860 bytes
SHA-256: 482a0a6a15997f3ba34007668752e2f9eeab1ca3f20acb3a0954e07d76b0369f
font_01_sfnt_off0000e864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10076 17492 bytes
SHA-256: 6279c8d823afafe014e0b7e314105dbaeaafc31393aea3f532863d77ab134f3a

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