Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3c7963b1ecdeae…

MALICIOUS

PDF

84.9 KB Created: 2021-09-17 11:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f2f8a24f7cd262df74d0cc32e45a6a2b SHA-1: b060f9b67f8fca390285e1d262f4c2a16d098ffc SHA-256: 7a3c7963b1ecdeaeec288ba2b26271f0e88c98b2e89e40272a99f84242da8538
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest the document is part of a link farm designed to redirect users to malicious content. The embedded JavaScript is likely used to facilitate these redirects or further exploit the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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 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://nomylo.ru/uplcv?utm_term=best+android+iptv+apps PDF link annotation
    • http://tainanrup.longi.tw/uploadfiles/files/20210902_094743_7852.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/bagodewuwitugemujigisemof.pdfIn PDF document text
    • http://partnercable.hu/files/29618184814.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/napazexufof.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16133f38dd5729---xutidoz.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/9850201618.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/16205690311.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/57591408735.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/87954351365.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/88523967372.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b29e11c79548eba1fe6778378e082f8d/33324276208.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/38092017675.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6c8dd89ef---13824745588.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/tumopesemoseb.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322358e514f---kitigozebiwesojawed.pdfIn PDF document text
    • https://jin-ji.com/upload/files/bakudu.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/92251261153.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/34120231990.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/20142673589.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/62998184100.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-4/20210904091256581642.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/60849783495.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/20593463266.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/digesolizixiko.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/nopibimopoguwo.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_off0000e740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE740 18244 bytes
SHA-256: 906548f524a3864eed1b892e2d67e2c0ab2ccf9dfe77d0e7ad344d3c17896cd1
font_01_sfnt_off0001167c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E93 10460 bytes
SHA-256: 16325af0ea2f250bc85a1477a2ec6df151d9c7b7a6178e3a57044654b8f853ff

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