Malicious PDF — malware analysis report

Static analysis result for SHA-256 0223f1b1a905fcbb…

MALICIOUS

PDF

85.2 KB Created: 2021-09-20 08:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f7c24209f969abfb0d7284248f266a64 SHA-1: 4aac654913813572bc99c28905e1eb6241fcc419 SHA-256: 0223f1b1a905fcbb549316ddb9e30337e670daa463760a87e8e4437be6d7aeee
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely intended to host further malicious content or redirect users to phishing pages. The presence of multiple links on disposable or compromised hosting reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e292cdb8d---97846548565.pdf In PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bd9cbe5c0---gosabanunekugiwaseditaful.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/rufagupe.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/61946596515.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/pezemorife.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/3560882895.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/besosagerojavef.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/dumomelukokukafawup.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/64408133349.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff979511dc---mowegibatutemonitafom.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/tupaderux.pdfIn PDF document text
    • http://dogable.de/userfiles/file/94267079819.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/26278359886.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/44189960489.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/pajusemeginekeveduwexibel.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/xivuwazezukolomator.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/91228345867.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/58636483413.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/80915234375.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/jemujatojor.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/vipafusutudenev.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/73028840727.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/xomedukizonesupos.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/3483065688.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/48926604072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=coding+reliability+thematic+analysisPDF 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_off0000e722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE722 18000 bytes
SHA-256: 5ecc192118cc9651347c96f67a422b72910038c19c9ac2e647aa3577456f9f91
font_01_sfnt_off0001153f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D56 11100 bytes
SHA-256: 835c79c512ccd0ee1cce4f1196758d52ef2eb2542f958650f80e45a3b8fc0d1d

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