Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d6ccb3970da565…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 16:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ff94078b82aaea2220869b718dc5095 SHA-1: a42a810de03c83a46503efe821707c539d3e474f SHA-256: 37d6ccb3970da565b6ebe506e4a38fade120d6f2415ee6efcf3b763aa2a03049
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content or phishing sites. No scripts were extracted, but the PDF structure and heuristics strongly suggest a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://uptownherndon.com/uploads/files/3226213824.pdf In PDF document text
    • https://aarhuskortet.dk/images/file/2693911332.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/81970281657.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16078a215300ea---wuvoxipuroluduwu.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/81500978036.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/tukomozovitinivizuvo.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/saguvetaxituguxis.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/625fefc017821596ad7534564242baea/feziverogav.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba17b43488---28710390378.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/78582266708.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16100f88736ae3---89311880199.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/kozekulikep.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/jajap.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f7a27fefbc2---rifukajapebuzuwuvuza.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/45507778177.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/83545624716.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/53871832893.pdfIn PDF document text
    • http://grupophi.es/uploads/files/mepimem.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608180dc23d5a---vojufuvavavuxexarumix.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb15eb2691---zevibapuxovozowovi.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/taduzisekexuxeki.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab622b4619b---kebozemubot.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/bekikitulo.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210620_E0355AB858E4E94F.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/delinakajuvosatoxoti.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16120345ed4822---34253650984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=2018+subaru+brz+owners+manualPDF 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_off0000d828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD828 10872 bytes
SHA-256: 0d8d197f5800dd565b4f88bded213412be3a1652023246283b4d68cd816708fc
font_01_sfnt_off0000f171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10983 19200 bytes
SHA-256: f704fa821c0123821ec6ee53988e23eef0900f3457afb4be7c8ef4c3d3d81acb

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