Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0368fef0d5bfda…

MALICIOUS

PDF

84.4 KB Created: 2021-09-16 13:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4802ab0e599853c3522e3a7c7c36b040 SHA-1: 4a41f4c6a91467a627b002d96f88e557a4629bca SHA-256: dc0368fef0d5bfda9c9e24e5ef33c7de9104f81fd9ed6e8a7946e31d4913974c
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, many pointing to compromised or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm designed to manipulate search results, and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM suggests exploitation of legitimate but compromised sites. The embedded JavaScript likely facilitates the redirection to malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://pixomot.ru/uplcv?utm_term=bruce+eckel+thinking+in+c%2B%2B+pdf PDF link annotation
    • http://residenceraffaellotorino.com/userfiles/files/nuwipumumujetigekegu.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/88132968931.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/86194365444.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/ditodupikixuxawevafa.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/tubefasivukuboronaku.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/forugozobokorenuwewusaw.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/35a0f98b5d254741c2c8b897a7271ac7/41828180383.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/15778518047.pdfIn PDF document text
    • http://i-physiology.ru/upload/pozaguxo.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/bivinaxexixomukafewila.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/28218511233.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/zudamididefika.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/rorovuvazabetapupatexe.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cda558487c---72343593232.pdfIn PDF document text
    • http://inphilong.com/upload/files/33905749258.pdfIn PDF document text
    • http://xfswchem.com/upload/files/62753000311.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/digilifafufugibipa.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/b67416df1493f450c972627f139d4444/vadovigogika.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/3536477746.pdfIn PDF document text
    • http://8njl.com/userfiles/files/33357331326.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/pumonavawovadoporuw.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613db9f262be6---rarajupipurimidafinoj.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/93129684437.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/11878544209.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/23404400135.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/502315634.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/fokomonajenonowemebad.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/jojolukomel.pdfIn PDF document text
    • 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_off0000e666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE666 17156 bytes
SHA-256: e4792bbc2a5db23d9dc21cc995960cf48734976c9a79d3629f09da12291a220a
font_01_sfnt_off00011313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2A 10692 bytes
SHA-256: 6e42cc2caef69c641129a370ba99da1c6b5d9b5016210fa649c4351673cb370a

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