Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b86c9120cabfb58…

MALICIOUS

PDF

80.1 KB Created: 2021-07-26 06:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0d8983364becb7553729912c5649d4c7 SHA-1: e00c47deea16de7be1a20a689187de53d80ab6f2 SHA-256: 5b86c9120cabfb585e067862a92dfd259a8b1b04779cf10cf26f5c4186843066
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to compromised WordPress uploads and disposable hosting, strongly suggests a link farm designed to obscure the ultimate destination and evade detection. ClamAV also identified this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://gillsandgeckos.com/userfiles/file/97248096677.pdf In PDF document text
    • http://munsusa.org/userfiles/file/20210610224733.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/0tl0ldo27nmu4aq6b56t2il900/25749883014.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/5o0q51sbhivqbpf0kdjs6cu63u/7583755317.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/mowebixuvojogolizekosi.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086ac27d5561---vemolijibavov.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/96364450515.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/eae2d5b683847e106ee371298682fd76/fotixududoliwexilinusez.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/firazowemojimemukufifij.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/totaragafoxesavajefotu.pdfIn PDF document text
    • http://clase86marista.com/clients/25276/File/3268767078.pdfIn PDF document text
    • https://medtek.vn/storage/file/55782962138.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d2361f1dd0e22b8961f290c763883912/32627519977.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/rudig.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/75633262219.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/7d0fa8ca30826ac72893d17aed798e3a/rologev.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160917edb19abd---92538739328.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088276a119db---liwukefodafupuvojeve.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/91685284122.pdfIn PDF document text
    • http://usmleworkout.com/files/file/sedusizozipogotafonawagum.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/sawogifiburumiravir.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/nalotelonor.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e198bf245---68930579019.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/eo87gbgu2q93jhaa9v0jcorgok/38873891223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=gcse+chemistry+bonding+structure+and+properties+of+matter+exam+questionsPDF 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_off0000cfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD5 11660 bytes
SHA-256: 601337bb514227d4738c405cbf77d56679d1a52edef6f2d65a206fb641c42ac7
font_01_sfnt_off0000eabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABE 16872 bytes
SHA-256: 9d107eef7592ef1769ae76a77f0a22be26e63dd87b94bfafc30cf587614b25e0
font_02_sfnt_off000116a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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