Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73c80727c9d5b22…

MALICIOUS

PDF

99.5 KB Created: 2021-06-30 00:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: eb50ea0c7331652f05604b15363ab066 SHA-1: b5413fb36e8dc8a79362a90d3d0f51d6f9f920aa SHA-256: a73c80727c9d5b2202fee8da2ffa24f7c1320a424035213509086378fe0feb3a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised WordPress sites, directing users to download further malicious files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic of encrypting payloads to evade gateway scanning. ClamAV detection and ML classification confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff89f7004b---78133441891.pdf In PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/03971818e197605f5bdcb00b9831f30b/wofalaropupepili.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/32768661141.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/n48cn446k5iok8s59mg1c8q1go/30106526506.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/27919700589.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/pebanexifovenujoxuji.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8d5a64b07---gijowugisubevi.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/es9truq3662b4jut54uvme27k6/xopunon.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/tazukebeno.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/farimiposuvafeda.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb41760596---kojelekasi.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/64972393271.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7f80e9eec---pijatonador.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608d783f89e82---16107220520.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c7cf5c9be---40636201507.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b97821898de---zasujakidetejesupo.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/e372916411a27eeb93461bd2261540ad/20470948898.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c6b2bdebc---14954894292.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d28364e56a9---12459679710.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/01225cb069083d746bf275f2bc11c80c/83436052960.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/a86ced77fade246634301afd322b41cb/mixibotafe.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/89702570099.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160731bbd1e7dd---tugikudafufufogux.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/hfh019envg70bc7q478n6vfbe2/33929580916.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/27719261336.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/dewukiwegugegot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=answer+the+internet+onlinePDF 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_off00012195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12195 17840 bytes
SHA-256: c73da22babc690bcb6bf7a1a3ffea84cfc05f0d007494d0fdd1dcf9d6616978b
font_01_sfnt_off0001507b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1507B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16892 10108 bytes
SHA-256: c9118c82608f3b232eaf76c8e2db6e133ee4249d76a4ee7b6d1d5742f8acb149

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