Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f415a06b4b2413f…

MALICIOUS

PDF

88.8 KB Created: 2021-09-12 13:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2941e78db671ad736974a456e577bfa SHA-1: 5e0b9f77b74aef1075db78d66c1b0562355daf23 SHA-256: 0f415a06b4b2413f122b182f614bd509f861d7507758e2f3cbb24d51235c540b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, including directing users to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://icrs-as.com/userfiles/file/75815943750.pdf In PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a519da4b9e---pisefukatija.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/p1inn5vagdsrkfjgbauq82hdqu/70067726620.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/nedewexogunuxuvusitesas.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/34541170173.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/32103823949.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613253c3ae579---44846659814.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/16253127301.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/zojaga.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/tizokoro.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/94152664917.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/nogesewamabarazo.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/85311124079.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210903_142256.pdfIn PDF document text
    • http://klinok-saintp.ru/files/mufiv.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/xixujoximijuxipepifafewun.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/xanoparixalarimo.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/97303939562.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/12592512863.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/99666919759.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/40502915781.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/87669570573.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/nixebifodokesubarare.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/77919243773.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/64101984557.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/24788074653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=best+app+to+facetime+from+android+to+iphonePDF 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_off0000f1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F0 19140 bytes
SHA-256: 74130fe81bbd07a80d1a3b1d77d1ad8433403f261245bf0a08476b47a4bad0fd
font_02_sfnt_off00013c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C17 10892 bytes
SHA-256: 38505b6a42845cb37033ab77a1876f0fc4dffa0407a89f8483773858a7a8ec79

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