Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa105345a5f6ff7…

MALICIOUS

PDF

75.1 KB Created: 2021-09-14 13:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d764aa81f669e7bc51dd15dc80979b0 SHA-1: 9d9bebea4c72c336e8c681a9cc221f5deca411ce SHA-256: 6fa105345a5f6ff7f295074f206d5d7e7257054dc01c2f39df5a5151d958de1c
196 Risk Score

Malware Insights

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

The sample is a PDF document that employs a social engineering lure, instructing the user to install a browser extension or update to view content. This is a common tactic for credential theft or malware delivery. The presence of numerous external URLs, many hosted on compromised or disposable domains, further supports a malicious intent. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://wastran.ru/uplcv?utm_term=sm+manager+apk PDF link annotation
    • http://cascinamana.it/userfiles/file/jabomani.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///55397046378.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/kizawekaxokujofabizelal.pdfIn PDF document text
    • http://kunbot.com/upload/files/wojibuku.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c06f80ca59---zixowozugexosusorap.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/hhl9d2ijsq90ak7hdarc1nce86/97632289588.pdfIn PDF document text
    • https://0900107678.com/upload/file/linix.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/legawiwedidi.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/tubedefavolivesap.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/41518242118.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139bf136aa37---76448608568.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/72541896425.pdfIn PDF document text
    • https://securitydm.com/slicice/file/mizarujenuma.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/47611255057.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c991341eeab986464381dd3b06338970/14079230602.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210904231328.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/42793122120.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/kevunofet.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/dagopef.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/63396868475.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/bupasosakebuzotiwuzefeji.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210909_A91549371D5A206C.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/81150567157.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/91523811412.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/girusejomuganulugower.pdfIn PDF document text
    • https://haidangpc.com/contents/files/39293743011.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_off0000c431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC431 16932 bytes
SHA-256: 75db850607faf5f41e18374f7b58a81ed97cd418cd59dce10f5a2ab3d3c8f8ec
font_01_sfnt_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 10236 bytes
SHA-256: 57fcfdffa32038cf64dfd97b9185edb7c14483441c50e4132393d2d7d36961cd
font_02_sfnt_off000106b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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