Malicious PDF — malware analysis report

Static analysis result for SHA-256 60db5a8b9a885576…

MALICIOUS

PDF

74.7 KB Created: 2021-09-01 06:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 02520ab43d0cd1444c8b4c77f2f733dc SHA-1: 6f293b0dd7758f65bc6acb006e5112fb85694101 SHA-256: 60db5a8b9a885576f51e93bb4ebcca3aa745f7acf1789665f7f0f0d84daab46b
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised CMS upload storage suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://stepsforstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/teguvegifi.pdf In PDF document text
    • http://benetalent.com/upload/files/7731275804.pdfIn PDF document text
    • http://domplus.su/userfiles/files/gazunawosokesoxudu.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/1c98d8a11d493f1f5ca2fc5e7ef0e784/letoxif.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/99d7e7526708958ec8c16160a473db16/juzil.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/84045401531.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/kubenoboluwolusawevazugu.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/27991101690.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/wamedawirulow.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160852e6b87143---julimi.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/43560286531.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8974e98383---dojobulirekitegafukaluwo.pdfIn PDF document text
    • http://brainerdhs71.com/clients/0/08/084bd9d902c6a1e3ee48703551c87841/File/weduvenis.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210626051730.pdfIn PDF document text
    • https://equinox-e.com/upload/files/palavukuv.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/56097994647.pdfIn PDF document text
    • http://remobudostol.pl/pliki/88637781663.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610510e10039c---64080486102.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160988c0335442---xemokeko.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/i9b22sj0bke8kpml3u8bltvnd0/vilovowekitusikaw.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/96746320407.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/viwapijagexukade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=organelles+worksheet+answersPDF 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_off0000c1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA06 16796 bytes
SHA-256: 83a5c54cdaa79d660c29accc9929d2324495505a857460b1c911dde6a476d725
font_02_sfnt_off0001059d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059D 10496 bytes
SHA-256: b89568ff7deb9988f86db2439b10dc2c93928fdba8584ad7d1d44c3e4ced081b

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