Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dfa142e8f341229…

MALICIOUS

PDF

83.5 KB Created: 2021-09-02 13:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7410a85795a7170046e4853e4c71c3be SHA-1: a05e3167ed9f83f55324fb813a38a03a18a0487d SHA-256: 0dfa142e8f3412292664210e1e7019e95f4bf686c380999dca3d5efd439a7f26
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics identified the PDF as a link farm, with many links pointing to compromised WordPress upload directories and disposable domains. This suggests the primary purpose is to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://melly-incendie.fr/img_db/kapuxopojovaxup.pdf In PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608881d02d988---64280789973.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/52990670199.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac8c91123c---nijitoku.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/47184903802.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6332deefa---36828987274.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/70045193153.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/58032478152.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/25411391574.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/kegaziti.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/6b9fac46ce83bf076432c702c379028b/xapaparimetix.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/galosivekeg.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/zepapogidev.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f97123553c5bab04127b216effb2a42/91481040609.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/99999688978.pdfIn PDF document text
    • http://blatt-gruen.ch/files/jedabesafeba.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210829171853.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/43781045514.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///ditejiniteromudu.pdfIn PDF document text
    • http://paliukenas.lt/i/File/6265202304.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f111e09bd2---70434296693.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab51c1752d5---87703363266.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/f991pre0o66vrt3usfjkcuuf0j/tuvipipavujanimuzudo.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c88c795acde---2659874102.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/kodofosix.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/56561259006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=bsim4+model+manualPDF 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_off0000e0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E0 10444 bytes
SHA-256: 71d4d332bfb5546213283f68a3b16ebb71167de09760d1fdc9f5c48c4f3e39da
font_01_sfnt_off0000f891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF891 18188 bytes
SHA-256: 78efc971f75b3076be58c496a65409b5bb2a7d577c455c941ba2eeb1fb6c29fd
font_02_sfnt_off00012847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1