Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b962509c77cc535…

MALICIOUS

PDF

79.3 KB Created: 2021-09-02 13:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 297ae0ad3ae63a42a00e71181022e271 SHA-1: 8ff543c6126837161b467713135b83a104c4c94b SHA-256: 7b962509c77cc5356ac6e354824a83d9a8835f73ee225761d765dec014d7d04c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it's likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, designed to redirect users to malicious content. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest its purpose is to host a large number of redirect links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://chcial.ru/uplcv?utm_term=doctor+patient+relationship+articles+pdf PDF link annotation
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18ea56290b---tevejowudiferitajija.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/dakodovoraxivirigu.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/lalatopenazefotulezubub.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/de41612efa298f55dd7dd8e7c92c0a9d/joxasiranozuka.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b7fe1cbee7f---bewokabuwumirasuxem.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/77102563443.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/22422978894.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/69696852534.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/59408994c3c5bc92ba2fe2f83d5ab26e/vefak.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/nudepigi.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/towubumekofufivazafin.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c26cecd4b39---fovipaniveworixuliluzewu.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/supuxa.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/7696300632db810577a4f7fe801daba7/talomedonidu.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609827a5e93c4---tugole.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a09ce3a174---14458104214.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/51260816201.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/13235464234.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160943f464cd6a---vugilojabowemekagelewoto.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db559537ea---pasimisibix.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/j2lff64gflekb7qhhu9brkss06/punene.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/45844944815.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/70779629517.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/78185718494.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_off0000d1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F0 17580 bytes
SHA-256: 0bc066baa040c6629e5f8d58a47beb07bca30e5f11895f3d5542d079ae6abd40
font_01_sfnt_off0000ff49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11760 10716 bytes
SHA-256: 5bace1123560efe5e80fe0725c59a3d4a35d773872e872044fcd991305a8815c

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