Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b32cff0fbe24b23…

MALICIOUS

PDF

94.3 KB Created: 2021-08-12 16:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 94472416def37c3530f443cda80efb66 SHA-1: 67fb72d755747abaada9067437ed38b2a80f6da3 SHA-256: 8b32cff0fbe24b2378f02d6f270f04230315bb974d7b22b88c640b29e8041cb9
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious phishing content. It contains embedded JavaScript and numerous links, many pointing to WordPress upload directories, suggesting an attempt to host phishing pages. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' specifically identifies an Amazon impersonation lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+get+clipclaps+referral+code.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c50275d817a---19852056619.pdf In PDF document text
    • http://barrospizzadb.com/uploads/files/legukumuvesibiv.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160757e5f10db2---16259451326.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88ed2b36b4---riboxababobotevetika.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/koloniparabasomuwitizu.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160cca12889e7b---jariredi.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/48671838127.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a360dcbc728---setifevivopasiwave.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b6931bcac283a743d14de16d517e8685/zojobogetajepe.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817a88ef138---2366632197.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/jemizifagedawodeku.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/miditewomatavufevozovi.pdfIn PDF document text
    • http://fittbikese.hu/files/file/25851533879.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/70685523676.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/47436574225.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160935d17a6371---14095513977.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/4206ca10aa9e155ed603e7f296967b9d/28763398177.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/8fa171057acb82e73be0811b3377093e/37551177712.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/193ad4d583933f7fd3345b37b21c828b/65010510409.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608653a9107bc---13839792967.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/reviwizipuruxorurovenerav.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/fjbmnj0ol9ihomd6hq1ceicq0g/nurotapirudiremiwawaj.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/vinawoxudorota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+get+clipclaps+referral+codePDF 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_off00010cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC1 10768 bytes
SHA-256: 9fffd9a865dcf1e5f825ff5584b11b22bba32b5010aa5567b8f354d7c2f28335
font_01_sfnt_off00012583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12583 17212 bytes
SHA-256: f6db4574ac53e94dbdb0eef2e32370785903e565c66014ae7ba8621cffe1ea2c
font_02_sfnt_off0001526f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1526F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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