Malicious PDF — malware analysis report

Static analysis result for SHA-256 a345a1b81a6245c6…

MALICIOUS

PDF

84.7 KB Created: 2021-08-20 09:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e24cb4c89dae224e13786a1dc5e32aa SHA-1: 7d5df41e7a587bf7e4c74cb3a7ec03fba997bf95 SHA-256: a345a1b81a6245c64b2a291815a78446dd6807e18ac818cf87bd0c5d9b28a6e3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites. The 'SE_PAYMENT_REDIRECT_LURE' heuristic suggests the content is designed to trick users into believing there are new payment instructions, a common tactic in business email compromise attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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 http://innovatepc.com/userfiles/file/mabamozemavuvodewutu.pdf In PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/aae4e5d7c1723352abe8aafffa2da3bf/zudax.pdfIn PDF document text
    • http://naucseto.cz/storage/74408066413.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f926be3f668---14258775583.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bf97e8ce7---64525031627.pdfIn PDF document text
    • https://dm288.com/slicice/file/zifotakuzu.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/nupokuruxukenux.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075fadc6f9eb---tenozolabewagibusu.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/17919786662.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/17624583969.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160f85ecf67ca5---34065998246.pdfIn PDF document text
    • http://chamdure.com/DATA/files/bemujitotujarifowobuxo.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e613d4650ee---piwivuku.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a673962f72d---mebupunawafagovod.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/kobagaxuvebopumi.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/wefirugarimuj.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/jizapogogubufo.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/52709966418.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0fb35935a77ab9a88e89c6e22584d67b/leluge.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/k44hfh2d30e92h10qqdru5kbv9/14988659475.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20257457135.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/b25edd11f4287eeeba1ac99a186837f9/2237542994.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/9f9575e1f7ae08ac023b866b10e29a80/jegamemuvasisisaxiribab.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078713ed0cf3---79320222688.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/8226913748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=free+download+petty+cash+book+format+in+excelPDF 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_off0000e246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 11396 bytes
SHA-256: 6abbaa92d66522e46b170399a3d82f973e745e75a89c320a24aa37f1aeeab294
font_01_sfnt_off0000fcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC7 18164 bytes
SHA-256: 532343816bceb4d465911f84a4fd8bbe3128f09a0d8bfbc515f0e453db38c64d
font_02_sfnt_off00012cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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