Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5161fdf6502b7ba…

MALICIOUS

PDF

92.6 KB Created: 2021-09-16 19:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d03bed64266a809c55b324f73a2d33d SHA-1: a5d276992d47163037c33ab1443390781a9ad3ae SHA-256: e5161fdf6502b7ba15a955c8eeefe70d705c818aa99025942f94ee9aa202b02d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URIs and links pointing to compromised websites, indicating a link farm designed to redirect users. The presence of these links suggests the PDF is used as a lure, likely for phishing or to distribute further malware, aligning with the Spearphishing Attachment technique. No scripts were extracted, but the PDF structure itself facilitates redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://krisoc.ru/uplcv?utm_term=how+to+sync+contacts+from+android+to+new+iphone PDF link annotation
    • http://oris-am.com/editor_up/nuzigulofatamipupamo.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8dc68b0fe---sunavorob.pdfIn PDF document text
    • https://birotex.rs/images/files/ratezarafakaz.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/49407660164.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090908491970.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210902120047_1970994525.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/3894848894.pdfIn PDF document text
    • https://fasaac.org/temp/files/93390920482.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/73316810570.pdfIn PDF document text
    • http://shesob.com/file/files/nafupotuteratisate.pdfIn PDF document text
    • http://forti.in/userfiles/file/71185995784.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364b4d7d3e9---gipomapiradadelonetiwu.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/50371800272.pdfIn PDF document text
    • http://techmechengineers.com/uploads/79173831517.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/81171485046.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/9071454834.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134d2d110aec---kuzotumepi.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/82379188461.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161376ead5de33---bokegudevuseg.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210908_AE912B621700115F.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135d501e1161---48738019718.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/71713894030.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/96805790388.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/88591187719.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e82e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE82E 17736 bytes
SHA-256: 2880ce6de37278fd39319429a43e07190ead15ee5c73616037981391421c9858
font_01_sfnt_off00010371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10371 18160 bytes
SHA-256: dc107898d95e6235a6155e639318d50aaf2c02926f222282ff2cef09cb24a8bc
font_02_sfnt_off00013225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A3C 11028 bytes
SHA-256: 3c36dec54c34b6b24fa6bbb4bb674b260042e0697795adc0b6d540b0bc836569

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