Malicious PDF — malware analysis report

Static analysis result for SHA-256 1073b11526842cd2…

MALICIOUS

PDF

80.6 KB Created: 2021-08-16 01:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 768cd6c36e4a9d527286becd70185634 SHA-1: f2f175fb0c2609ad97f57343c6d09b694c38f418 SHA-256: 1073b11526842cd252e3621d9dcaf9cbcf558d4f4284e28913b61249bf6ce589
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of numerous PDF link farm heuristics confirms the document's purpose is to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infotechb2blite.com/bot/ckfinder/uf/files/rugedodod.pdf In PDF document text
    • http://hilimall.ae/uploads/files/tizebuvamewubuvaxonigub.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/lulubijuvunan.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/fodefumazelibup.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/6d0k5voav0b0n3i2pdjkf1nmdb/57742080427.pdfIn PDF document text
    • http://fxmeat.com/upload/file/3984081ea16e2564405ae18cbfcd7408.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/tezudopasuvewawuz.pdfIn PDF document text
    • http://adveotec.com/img/file/55871327897.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/xobupitatuwixozi.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098f703bcbc0---nozujanapixokutefakozo.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/48343449553.pdfIn PDF document text
    • http://mesterek.net/tmp/25463872691.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/6178b6a73bbadea2ae55b650488dbc98/49926870329.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104c6c0af9d7---putepogikibolofowapuxu.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb3c7e6639---sirusazamemebesonusafibap.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/7b126433a39917880e058135e599a627/nuvujed.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1b16816351af0ea487850cf97c851efa/demof.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/44502523331.pdfIn PDF document text
    • https://srmresidences.com/images/bulk_images/files/togojepanukijikebo.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0bdf576e1---notir.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076206aa1c20---52771430802.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161175ad5a2f5b---25078949821.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/pubewerigikodod.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f473ec493b5---vatolesigolurolafizozid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=toca+life+world+free+apkPDF link annotation
    • 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_off0000d8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D9 10384 bytes
SHA-256: d193ebf4b028c0317dd041b21743a81a2c4cddef4e31f2005ff4233fb53c70f9
font_01_sfnt_off0000f07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001088f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088F 16976 bytes
SHA-256: 10fb369755c5de11b270dafab4d4cc70ac9bf12e54bba65b11a47e75e72405e3