Malicious PDF — malware analysis report

Static analysis result for SHA-256 13efcb74d2216695…

MALICIOUS

PDF

72.5 KB Created: 2021-10-05 03:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fa14021239c51da37f3fb1f883e6d805 SHA-1: 239b7072aa6cddd44debb248e1dce61505a812f1 SHA-256: 13efcb74d221669585dd824d970b29473dbe615e078f1f860ab0dc01168eb9b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=roosters+breakfast+and+mimosas PDF link annotation
    • https://interstudy.net/userfiles/file/givegokafilidujogek.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/93498485283.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/polekapibinonozadonim.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16156e8fa448da---80215338907.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/sewepupegimadakizok.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/gozinabaxetipapufi.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/40196595640.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/50150501483.pdfIn PDF document text
    • https://fasleh.net/Files/files/65202522721.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ggj6bl24m67e5rsg8jm1b7vg47/75239485053.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/6bed86fe46f2382c70aa935e4e796044/59030034123.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/mofej.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a47a8ebad---tizuwepetijoji.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2110021740535083298ptyml.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/36577908089.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/zazawepepinarizi.pdfIn PDF document text
    • http://dubossari.es-pmr.com/constructor/dubossari/ckfinder/userfiles/files/1674062821.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/c33243dd6037c47704ba74de2c9fd743/famifemi.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613514d7a5e75.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/93630640449.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/dakijirobugolosadepuralol.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/61176598928.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/5286681272.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_off0000b88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88B 16664 bytes
SHA-256: d7e64914f4dfe4d4df15effc6f333ac8f311e5c187b449b01004c720b0148cd1
font_01_sfnt_off0000e340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE340 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB57 10748 bytes
SHA-256: 459f30229556f3a2fb7d1e0bdf1bd7898b865a392dd897b48a50c4f05cbe5ae5