Malicious PDF — malware analysis report

Static analysis result for SHA-256 0777f024c161340e…

MALICIOUS

PDF

99.9 KB Created: 2021-09-04 08:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b8b8beeaf587f49c2c2e6fdabaf0a87c SHA-1: a3c96e23fedf43d72fcd0e2aecf0fda466e8664c SHA-256: 0777f024c161340e7f6a3dd95f7821f1a689711afdde0b808563e30463e2d994
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The primary attack pattern observed is the use of these links to potentially lead users to phishing sites or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://alianzatours.com/imagenes/file/zegofavorafi.pdf In PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/jadoxadodebovotoxulejuza.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/86256875585.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608349c2ae0ff---14217227232.pdfIn PDF document text
    • http://cecev.com/stockages/files/rumirujexosavi.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/6b3b602b03c4a0d4e027bba46ab87658/putigasof.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/ganaduwiketibir.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16129abda21eb7---gegitatudametovu.pdfIn PDF document text
    • https://polistirendecor.ro/app/webroot/files/userfiles/files/42673528407.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/vuvutej.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/0452caa13c2390408de065cac3504218/sepovipafijetimufubid.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/moxamujazek.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/66256659621.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/dekedepidejimujixu.pdfIn PDF document text
    • http://thedigitalscorecard.com/userfiles/files/7402328031.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b2198c17740df54a38fc185aa2c7dad1/8786617919.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/ramafajabevazopadinixewob.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/pipurewikeruwefej.pdfIn PDF document text
    • http://favourtec.com/attachment/file/josozeviwin.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4172603fc---8031778593.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c743b10fc4---19885223728.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///pozotumuvumupaw.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/63883360498.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a8899c09710---27389329517.pdfIn PDF document text
    • https://nevisnews.com/userfiles/kisipolawuzezo.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/01a275a268dc82013c2951604380d13b/kirabedovozubipekoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=physique-chimie+2de+exercices+r%C3%A9solus+%28physique+et+chimie%29+-+seconde+pdfPDF 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_off000112fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FA 21820 bytes
SHA-256: cb29aafb415b159768fbca8db23b6e6464709511fd9574cc47de6519b227dba7
font_01_sfnt_off00014a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A79 11652 bytes
SHA-256: e3c837090bb37bc07a7255b1cd62792c02e0e7e410c5ff97b71e30052e671c94
font_02_sfnt_off000165b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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