Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58325b5bd412b3d…

MALICIOUS

PDF

90.2 KB Created: 2021-09-09 05:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e340ddc5aabbd9b5bef529a79a6043b3 SHA-1: f1313c68f0f5bb3ca2088f6c40b4d54fd13534d3 SHA-256: d58325b5bd412b3d55f4bbdedb3712cd96a374638cc2d4f772bbf8f63d1a755a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing malicious browser extensions or updates. While no scripts were directly extracted, the presence of numerous unknown URLs, some hosted on compromised CMS platforms, points to a phishing or malware distribution scheme. The document likely serves as an initial lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135038eb7b86---puzapo.pdf In PDF document text
    • https://pima-alarms.eu/slicice/file/80780958894.pdfIn PDF document text
    • http://szm.hu/userfiles/file/6568154988.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/vijariterojiziv.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/59070239282.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/86749036947.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/32985058603.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/tadimimasijaduvakupodefa.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161339f211fd11---43117359139.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/luwasumujulonogog.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/samubojaxuxo.pdfIn PDF document text
    • http://arablift.net/userfiles/file/muforijefuwugowubol.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/85792683018.pdfIn PDF document text
    • https://sanagustin.cl/files/35917292662.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/rawepefisuzuli.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/lovinaxeni.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/6277ab6451d720f9a669f91764d41baf/47869007059.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/29969962037.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/13057513413.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/zusefimuvit.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/xitoxumujagefa.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/wowojutapubu.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/83337462222.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613445bc89bc8---nubukivujegerikidu.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/69150022118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pia+android+not+workingPDF 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_off0000fcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF5 10256 bytes
SHA-256: d58862a8ab5f1a09b38f33def575310b612fa0c4c023fbb039e835a24ea67577
font_01_sfnt_off000113e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E9 18204 bytes
SHA-256: eb6ea9f85cf5e17e5234beea856c5432ec91299a9fe62c74924bc69bda75cc58
font_02_sfnt_off00014331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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