Malicious PDF — malware analysis report

Static analysis result for SHA-256 5836110d8a6b8ef5…

MALICIOUS

PDF

84.9 KB Created: 2021-09-06 14:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 503abce9676ca04e9b8fcded2392ec40 SHA-1: 9dd3c4ab1cae94dacf8a2ac443d6fcb0ba28158a SHA-256: 5836110d8a6b8ef585c3058aa93add72db17ec32e8bc809ac53c1cb26561ddd8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the overall structure and URL findings point to a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=system+dynamics+ogata+4th+edition+solution+manual PDF link annotation
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/259d36ba287315673e22a8216c9a0088/pefanusilanow.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/2045495342.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/11559017604.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/15647876010.pdfIn PDF document text
    • http://progetec.org/userfiles/files/dovozevakajuzova.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfe609b591---fonenebavonalovobonamogej.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/84854540366.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/gutemix.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/10860402922.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/nizevezemefe.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c221aa4ef46---gixofozabumaterol.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609214d12c2a3---84499682978.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/327b39ddc65d6c769b87a2888b4cff96/wunisibegiwej.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751192ac941---repokutoxugopupoj.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a8eed6b01---20793348043.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608164499c75f---jagabapivobanenelevabi.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/20880184276.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079a7d4a8782---zonebe.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/582145a90ad2b6725e8dcb384bd01fe4/xopaxubuxotekawikoxitanid.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b348d5391---vababunenojoroja.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/dijux.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838ba203706---42391522415.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/763hcods0gnjn65601vikduruq/7892514828.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/bizevabalurixux.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_off0000e038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84A 19604 bytes
SHA-256: 6f1cb22fe85ce8dbaef4955670fc97b6a90f03792db7d095dbfe21eb616f9531
font_02_sfnt_off00012bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD1 11084 bytes
SHA-256: 9c408b17d12ca3fff4daf728f95625e623cd7bc6da85bfb85e80c267bf7e1d0c

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