Malicious PDF — malware analysis report

Static analysis result for SHA-256 824c3f40e8e50f08…

MALICIOUS

PDF

69.3 KB Created: 2021-09-24 20:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4680f59a47b8f7fd8ed68fd136176b53 SHA-1: 6ef48315037c20875633f66c040875a6cb5edbdc SHA-256: 824c3f40e8e50f08757925b30c0539d8a34d82c03d27f1c9fd5f33675476705a
176 Risk Score

Malware Insights

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

This PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a screenshot disguised as a document, with embedded links pointing to compromised WordPress sites hosting further PDF files. The document's structure and link farm indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://idosekotthonaveresegyhaz.hu/files/files/sugiviwobomibuvidides.pdf In PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/4496591029.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/e3bab38c72de8e06283827d62098bba5/regam.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/21583900282.pdfIn PDF document text
    • http://thaoduoconline.com/userfiles/image/file/98515088572.pdfIn PDF document text
    • http://halkum.rs/files/totixowedijozobisilosasej.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/38c24a9c0559faa125e1a7e6465d0421/37651093566.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614659a5da19a---zujes.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1a6a95f88---67424609007.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/72702366322.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da94b32b83---vovarinujewunafulixojoji.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/a182a7acd5f2bca38c308453b746af1e/32392088996.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/livajefabunomowipufuxopod.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/58246158221.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/dopifapapi.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369acc2b9a3---19984411311.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/81209551482.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/xiperixobu.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/60536211126.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/puxolebulijejexoxa.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210909_120310.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/koxijebadav.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/29388802077.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/vumajiw.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/rimarid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=bollywood+full+movies+freePDF 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_off0000b427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB427 10572 bytes
SHA-256: f22dd90101d6f788318e3427cde1fd6b457eea07a0f8d912ae783f6cff7b66eb
font_01_sfnt_off0000cc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 14144 bytes
SHA-256: 38016bb7e1c5aa0e33ebee918eff76995f91b4f49dc37c3207166189b2b4070a