Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3125433f88d2f0…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 22:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bcdc5bf8c04dd833c19212f7a62720b2 SHA-1: 25d99c693601189aa2b96dc861e6d06e806210ff SHA-256: 5b3125433f88d2f0e821b49773559534e3a2d981147b67eb2e986c35f2dd71a7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://n-production.com/upload/fckeditor/file/30505556312.pdf In PDF document text
    • https://anakmeong.com/contents/files/gulizazuwezugudikunal.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/16550301348.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/xegabikovuno.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/21112172208.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161306d2020cf7---36979298328.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/rajoka.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/50769607877.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/5283543896.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/61423376140.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/bumesudupevimatulesig.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/fezokirenidoverunu.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/vironirezuzovoduwezegeza.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16137747863677---tazenuwu.pdfIn PDF document text
    • http://telecycling.info/files/file/pifokozagomokowuvubi.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/lizatiletexakotixu.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/55589852641.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/81590549562.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb279e83aa---sedux.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/zizadajimoxinesaxa.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/demexagezojelano.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/bonepanusuzatusedal.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/69617252869.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210905_05612313DDD6B66E.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=compare+poco+m2+and+redmi+note+9PDF 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_off0000db37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB37 19172 bytes
SHA-256: 91747dee469f76c5e938c77352175d7f17054650b8581e21e9ce29cc22d1fcec
font_01_sfnt_off00010da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BB 10780 bytes
SHA-256: 5ee66037b71b78c2a6e7fa062035fc0d1b8579ded9706cb7e2485df298280a64