Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a42dc6e6eec4297…

MALICIOUS

PDF

88.8 KB Created: 2021-06-29 20:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: cdc861a4e6fcb90d32a09eda4fb9b388 SHA-1: ddfcce39eb0021a3359b6e8d1b1852fe94662bf1 SHA-256: 3a42dc6e6eec4297c731a8669f310e08c1cd598e01efbf5c87f8ce3493f322c3
156 Risk Score

Malware Insights

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

This PDF file contains numerous embedded URLs that point to a variety of domains, many of which appear to be compromised or disposable hosting. The heuristic firings indicate this PDF is part of a link farm designed to redirect users, with some links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://synerhu.ru/uplcv?utm_term=the+power+of+a+positive+team+pdf PDF link annotation
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/sinalebofipu.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/36293873386.pdfIn PDF document text
    • https://bursac.net/userfiles/file/bokiwiwanibelik.pdfIn PDF document text
    • http://muszempilla.com/files/file/lurelorositebilogafali.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/t0g59208gvbqrvfba7lmlg419u/madox.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/65e037165efef3ad8d54fd6de777e76d/18918939486.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5a3a627c1---66497776114.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/ad9c6f2dd6e50c24793ffb89dd090ad5/pazijugamolukugepinedu.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c036289461---zalixepusowag.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde0c55a91e---31044794487.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16088ed2d902f1---juvumeresizolafebuz.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/97f46efb372ebeeb0a63f8f914cf9de7/gawelozaranitojo.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/nisofajofeb.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e6260cf2b---gefutefixiwama.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/485aa5c362a2e7c26df1c9401c724998/45193763733.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/31441796353.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790469882f8---xoterawava.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f41f3a664---49304486265.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77eeec7f09---sowadikumokatepovitofuxol.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/cb7ada477f2c441d5e7389872a84d086/nikawalifopedajazagenise.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/eq5ougq7p3phe43ij3n2crso9s/topetojuzerezovaboje.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/wusinem.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/fejun.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/f7me7490phfn8r1dlhrg00j3i1/94320388959.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/2qvqrtv642ovr0rldd479k77c6/39390745224.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/t5moldi413nanes9hgq08ir3kj/fodofit.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/23746686840.pdfIn PDF document text
    • 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_off0000f980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF980 16680 bytes
SHA-256: 9011669628d2f636b2c53c257a759da57c9ecdcb3aef26b8807e13f137dd0308
font_01_sfnt_off000124c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C9 10728 bytes
SHA-256: 33d2bd91fa41220f95b044cc0248810a7db515777cb5ce1eec2ec2973f95b5f3
font_02_sfnt_off00013d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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