Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ca64fc0dfd4d19…

MALICIOUS

PDF

80.6 KB Created: 2021-09-23 00:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e858b9275a42b9f403b827c1debdc20a SHA-1: 3943dc2ced4e45cb604b04ab20d4317bae1b1abd SHA-256: e1ca64fc0dfd4d199bbf222bda59905eac51ea84e19f3b7ff7e3ad7c6b01d636
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised websites, indicating it's designed to redirect users to malicious content. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests the document's purpose is to trick users into believing there's a change in payment instructions, a common tactic for business email compromise. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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.
  • 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 https://pistant.ru/uplcv?utm_term=how+do+i+transfer+my+contacts+to+sim+card PDF link annotation
    • http://poketomecam.com/uploads/files/22134652150.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/fe3892f67e719fb84218a04afbb75415/dowivukejazebunefegetine.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614202eddf55f---79985514269.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/dokereniwuxane.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/23330335071.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/vodotide.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16135278d03f73---45881002526.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614058462aeaa---32862692382.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/43527580690.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/67870367434.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/kumik.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/62539183660.pdfIn PDF document text
    • http://www.bash.cl/media/file/kukobotuz.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/21670076735.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210918_061303_2000.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210906131030.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/76750636196.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/73132975060.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/81345965498.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/93698537475.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/vasefazuzanajeg.pdfIn PDF document text
    • https://majubesar.net/contents/files/xajukibotufujevuz.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/6600041117.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_off0000d494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAB 10780 bytes
SHA-256: bdbbe910779c97cf1311c3905190bcd3b65b90a690e893dba69aecfd57ddc1f9
font_02_sfnt_off00010586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10586 18428 bytes
SHA-256: 4353432626108c74c37f33674d3a7e8f079bdb5ca2df646cac2873a4fe87e314

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