Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c926c2ccb16532…

MALICIOUS

PDF

71.6 KB Created: 2021-09-07 05:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 594efefa15d34a66fcd9a7711eef2a8c SHA-1: cdab1094a9d9020a238e2f7b19ef5e91727b9a32 SHA-256: c5c926c2ccb16532fa6ac21c0edb10517f88291eafd2825cd0bb97fdb470e9c1
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector is the malicious redirection via URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/kilukuwidafowowerimatoja.pdf In PDF document text
    • http://systemsbiology.at/uploads/assets/file/dareduzifuwonetumitikumi.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/18f4188c1bc804d50924ccf90f5ff63b/12423674973.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b950a46c462---97599577312.pdfIn PDF document text
    • http://premo.at/userfiles/file/zekapeg.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbe7a1db76---27020614705.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/26495076998.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb30c8e302---69482640046.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abf8ebc8b6c---nukotug.pdfIn PDF document text
    • http://o2ashop.com/ckfinder/userfiles/files/57545310173.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/bd3a59da455cd900f289c5673ed05fd1/81254702685.pdfIn PDF document text
    • https://bioesteticaonline.it/file/27966843103.pdfIn PDF document text
    • http://gptools.net/userfiles/file/luzetiretonamosute.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/5742b249314c3de21a5d4ab208454825/78244787797.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/rpme672adktv8o9nff61nhmdu3/jezag.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/ferigapetaxegogejivotej.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/63658522558.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/fd72229704d86219d31b391506b6d0a6/58825392535.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa08748eba---22454337257.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/jukonotibaxo.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cd942e95a---88988748004.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/zusagikimes.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/8304cbaa5a9f434ec17e7b46f4aa4901/zuxusukivakotefoguwolak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=would+you+rather+questions+for+middle+school+pdfPDF 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_off0000b910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB910 14832 bytes
SHA-256: 174c7b6ed874ab0502ce71c1a1d34f85d932169fcbace516d15e112f4d96143e
font_01_sfnt_off0000de46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE46 11236 bytes
SHA-256: e99384425878f1b1abc1b55ca1929f56e5dd785b84ff9ceb44a082b2cc76d974
font_02_sfnt_off0000f83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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