Malicious PDF — malware analysis report

Static analysis result for SHA-256 80616982133db92e…

MALICIOUS

PDF

155.6 KB Created: 2021-09-06 11:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8565be6f385543cc33b963f79590a831 SHA-1: bc47cfb7ea63cc954da8cf33a6357ea8bdba3f23 SHA-256: 80616982133db92e289f3ea0f15840b3057897dab40f54515bc8853ab1f5c2ec
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of these links indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://archism.ru/uplcv?utm_term=comets+asteroids+and+meteors+quiz+pdf PDF link annotation
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608f309f49482---duwitiseg.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/85624237527.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/67150410637.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/80700740538.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/20910983956.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/6409780027.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/353cf4f935f95aed914e9330b1fb5b0f/kamekepulumaganose.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/55413581637.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/23632029508.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/poditomekozixev.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a06ec1593---87406936299.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609075278919d---16036757713.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/92976938371.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/miginonafavewitu.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/lulifogol.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d03512a2dd---vufigek.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a7ea5436866f18c73535129408923e5c/rawaxebibidumovidet.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/99393908074.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160762e5fc2720---25547016092.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/74f5c668b4a4a627e899cef1594de0a0/72023169608.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/zisiratamewipuko.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff00d4bf087---91076559034.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/lofaweselesamowevurolew.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/696ffd07285a70dd14beff20844fd8b7/78471123230.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_off0001f656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F656 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00020e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20E6D 10952 bytes
SHA-256: 7d1fe59b19b0bc51decbaa07083a4e9ef9edae9ffde0514d88b84145e9c00fd5
font_02_sfnt_off000227a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x227A2 21668 bytes
SHA-256: 884daebfd5129615efea28c92fe3fdc829e597497c48bbcf3c123b62c0dafd11

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