Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c585bf72a5736b7…

MALICIOUS

PDF

85.5 KB Created: 2021-09-15 09:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e56eece36583a0ff98ef6c7696e3e082 SHA-1: e6a4836151316914c5e77724f9b955c9e4507a5a SHA-256: 7c585bf72a5736b738f647b291e9c7007f59044512388918b2e4cdf237a9f89b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://huntic.ru/uplcv?utm_term=why+is+my+phone+playing+videos+in+slow+motion PDF link annotation
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/43905606753.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/bazazokavemoletalananitod.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/texibumuvewupajabevom.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/liwufavosixaxaf.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2835cad7050c78cc2bae9636f0accca6/93974080310.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/zigifugisufagose.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210902095405.pdfIn PDF document text
    • http://kaies.net/upfiles/file/59083333262.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/jasajanezidukudaserape.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370c0991a2c---53263938349.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161414e6f3f154---kifazorof.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/vaxenugajelupirukurini.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/xisepelup.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/49758540952.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/fagetinenoxivojeto.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/30625634230.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/fisozuribekosibuximaxofex.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/telafexazodudomeb.pdfIn PDF document text
    • https://udruga-invalida.hr/files/27900930030.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/gabexuvotaga.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/wogaworoponibewatif.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/81563131159.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/51371298034.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/numivu.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/68909444719.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/f2ac023fbb13d1fadf375e9b0e68cf7e/24280616606.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_off0000e8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10110 17568 bytes
SHA-256: 0e9e661c2e316c90f2d69c8dd7ce13d07b025e986776fde9cfebb8bc04c8c8de
font_02_sfnt_off00012ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF5 10996 bytes
SHA-256: 5d8e9f8e9ab186ff8b0370be7c64ab6517f32002378be843079580330ffe0573