Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f79ebbd1b29c701…

MALICIOUS

PDF

92.5 KB Created: 2021-09-17 12:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: bd19e1509e671b57b017059c8ed60125 SHA-1: 19331b8492b7947bd5a08ad536b3df0d9df43411 SHA-256: 4f79ebbd1b29c7019df1707efd5f39d6bb9e8364b5302c2b7f985fc6eade8b95
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The heuristic firings indicate this PDF is designed as a link farm, likely to distribute phishing content or malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://archism.ru/uplcv?utm_term=old+war+movies+free PDF link annotation
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/jazur.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c8b1d939b180628d45bc22c31fbeb17e/kotebobikosagi.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/pepolavefiworidole.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/pujafezamagezadesupovi.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/sotumavefomizef.pdfIn PDF document text
    • http://platcometals.com/images/file/33897120841.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/jigofagetetanifapok.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/wukixibo.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/85498633737.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/jebazevepidevis.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091409133290.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/zetufebozixix.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/batidajonolorewovebun.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/moxajavadinewekovadiki.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/jigukafu.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/2548587045.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/telelu.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/80082879381.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161437184153bd---29534181544.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/12937717429.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/3142627350.pdfIn PDF document text
    • https://ienter.bg/files/fuvebaroxepi.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/ruvezufubijukudofogupoxiz.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/90b864f614b8ae4310016efe3bac52da/34586563124.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_off00010673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10673 17632 bytes
SHA-256: bea8e4fc78830f9b2b6aee9b345fd3e0f66ef4d819af5d58a162989d77b56537
font_01_sfnt_off0001346d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346D 10488 bytes
SHA-256: ab5c7ba644d341f86fb5cf4805ad5638c02fba5443b38caca13e6204f08e0237
font_02_sfnt_off00014c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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