Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa64f9f7d41cdaf…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 13:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5b3b9bf4c87d2d9581d31ada229afd1c SHA-1: 27e8871c9f6ecc628387287c505b05caeaeb777c SHA-256: 3fa64f9f7d41cdaf0e0c35e28a361d19589fc8e16e5449eb118d2209274d9024
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed for phishing or malware distribution. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests a business-email-compromise style attack, aiming to trick users into rerouting payments. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=put+pdf+on+kindle+paperwhite PDF link annotation
    • https://u15.ch/ckfinder/userfiles/files/90660199816.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/83005367851.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210910_AE99CD20FE964E36.pdfIn PDF document text
    • https://norservis.com/files/files/ziximuvekoj.pdfIn PDF document text
    • http://lizhechem.com/upload/files/parilixukaliwarexivesuduz.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/waxatiduvezimirakosunija.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613faa666d41f---mavesopowofoditi.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/xamedenizabuta.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/41273125584.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/38405838701.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/39739723885.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/50074038374.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/fenanefukasosoto.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/gusakutowijuputo.pdfIn PDF document text
    • http://www.first-classlogistics.com/image/upload/File/bugefakanozadadibopezepoj.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7dbc39f12---25815461984.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/9ffteonann055710bfu8u9ut39/firunevovegamamafejosutil.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ufjlootem39i1n4kihabu4iemc/6724113400.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/77604287963.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/44681432052.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/siguzajoleroza.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/bepofu.pdfIn PDF document text
    • https://kiptep.ru/file/didaxon.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/42888691866.pdfIn PDF document text
    • http://xhzhengli.com/upload/37731676088.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/45975851130.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_off0000d7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FD 17252 bytes
SHA-256: e784bfeefb95c789ae77bab92f2a71fbaa4707672c5be1df4b9c3f1eab9cd1fe
font_01_sfnt_off000104da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DA 10708 bytes
SHA-256: 7562dcdd1b8a52fd0cfc32295dacc2c42d3b55d3d8e7052f8aa161bda90d8979
font_02_sfnt_off00011d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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