Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56b4b7ec2284369…

MALICIOUS

PDF

125.5 KB Created: 2021-08-16 08:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cde485079a0dcc1ac80bae190542b519 SHA-1: 893c05015483ecbfc85c511b130c5eb1e6870959 SHA-256: f56b4b7ec228436926f23ad977a68efc36775205b6a17eebe75e0106572e8601
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to external PDF files hosted on various domains, some of which appear to be compromised WordPress sites. This suggests an attempt to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vanphongphampmc.com/upload/files/78338900379.pdf In PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/17fe60af01f4e764baf87ee7eb71d3d2/lixuzevexatelomarexomej.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/66068311126.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/37229791106.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/letazowidusixozetewozej.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3d90dd556d---14049913679.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/wepog.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/10405224726.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/96582502824.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210802232748.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3668add20f---fupimipaxagevivikipovof.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe9e303cdef---27788298751.pdfIn PDF document text
    • http://brlairport.com/images/file/23351761944.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/94519774100.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/20709434859.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/robexotunixosoxeput.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/a564cb75416d1551d012a210f31b3c8e/61452792880.pdfIn PDF document text
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/xixirigatiwegafevute.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/jalekot.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161155f0de07ae---89589764865.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/592dca75e482342ae4d240996521a2bb/firumo.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/eb655ba88540eed3b49e2303437289a2/tapup.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/61766169997.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/l37so5bet4f2sm5llc1oajns7l/1226969035.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/pumodudafuwewulosijetanej.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e8ae7a558---xukejufivaboridazun.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/251310263032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+put+a+deck+belt+on+a+craftsman+lt2000PDF 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_off00017fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FB9 19568 bytes
SHA-256: 90ccec3824945ca9ef221f84392da9ec889b577f203712bb367ca96d5111d392
font_01_sfnt_off0001b3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3E1 11340 bytes
SHA-256: 92921b30316f28dbf1f9bd90d2091235826dd0305a8390c258472f0039a61884
font_02_sfnt_off0001ce74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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