Malicious PDF — malware analysis report

Static analysis result for SHA-256 70db469e10281438…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 13:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5b511173f8dc1aafd04993c6ceff7e95 SHA-1: 8cd1f9ca13fa26461dedeea161b8f4183d1ed4f3 SHA-256: 70db469e102814387c8b0171375e86e7ea16b884313ffb51fe2385455a624b5a
196 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates the document attempts to trick users into changing payment details. Several URLs extracted from the document point to potentially compromised websites hosting PDF files, suggesting a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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://richmore.kr/uploadfile/fckeditor/file/defamejivazegekexoba.pdf In PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/sutudiwor.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/kemizidebilu.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ulgas29qgli6i0dnavl86s5tbk/83718454605.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/11955920436.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/jadufupo.pdfIn PDF document text
    • http://wohntraumgmbh.at/ridofi.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/70847613101.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/gozemevepedijoxuw.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/50644017878.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109121843076723.pdfIn PDF document text
    • http://rc-modeller.se/images/file///89112595270.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/golopawi.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/nosiwevibaze.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/46092544114.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/49372546335.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/minekinofupodaduburefu.pdfIn PDF document text
    • http://cityfate.com/files/files/dunomunuxowaxubize.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/69510637409.pdfIn PDF document text
    • https://33mobility.net/uploads/files/31805135066.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/76826757383.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/mixefagukozetadava.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613283f238b70---27479712030.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613784e7496d3---86657041115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=carrom+apk+earn+money+downloadPDF 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_off0000d848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD848 10516 bytes
SHA-256: f2277b2159c75ff1aaacb798a8b29ba0324999d364e99f98fe57e37891c37ee2
font_01_sfnt_off0000f036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 18120 bytes
SHA-256: 7a5d1b57cf12ecf1996f8dc3a3189e5dc02e36d9a6c0556d5388d6c245aa2335
font_02_sfnt_off00011f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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