Malicious PDF — malware analysis report

Static analysis result for SHA-256 6737d0b6e68ee007…

MALICIOUS

PDF

82.2 KB Created: 2021-07-01 11:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9791ee892be53616bc2f5c2b478fdaa8 SHA-1: 5e6cd0b5b8f1ef6a96edab6b5f10a2c818685f97 SHA-256: 6737d0b6e68ee0075da5688a6160a3b5956d067703f35e6e56e72acffe88d6a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The sample's structure and URL patterns are consistent with known malicious PDF campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865bb0f2786---31167365246.pdf In PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160877863c2164---72474348108.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a139eda631---87302069882.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/44847356002.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/puverudisozuxoliguxixik.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/8373261107.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/vg8glesjok5628i7b5g1ot7tig/kedumonegirujalapuwavo.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/39958041054.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160802fa306956---99117526595.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b053060c6e---vazoniradudupubiraw.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/42629768322.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607513a1549ca---38291084377.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/vemelofugujejuxizotizubo.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/49889407846.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16083ad123b70c---tovizov.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/gotutasalepinosefawepojem.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/fbc1a644eae2144915336658264d1185/50760454627.pdfIn PDF document text
    • http://allasclub.com/campannas/file/sifegikowereliwagutibino.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/nuwetofe.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9695c9aa87---84724764757.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55df96f704---xipomiguxevowe.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6eead2340---85706324453.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/zakajulekak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=replicate+meaning+in+englishPDF 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_off0000d96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 18392 bytes
SHA-256: 28e037b40e25b579dff6fcb7482c0e02cc5e75a9bd470e56daff060221607503
font_02_sfnt_off00012209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12209 10644 bytes
SHA-256: 732f258f51bf2de7c15e6da05e1064d6798efa412bffcdc3a35362dd10781201

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