Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d78989f3e3acafd…

MALICIOUS

PDF

84.2 KB Created: 2021-09-03 00:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c37d9a44f82417571a9a5e6a68cbbcac SHA-1: f7710e980d8595dd6d4d96191a6f17c08ecb1e85 SHA-256: 3d78989f3e3acafdba65489b279840ebb879382d7f47a8c7d0d77464375cc51a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://puzynowska-kancelaria.com/userfiles/file/48342120903.pdf In PDF document text
    • http://agataklimowska.pl/userfiles/file/94692156706.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/12818317828.pdfIn PDF document text
    • http://splogservice.ru/content/file/sufidajanurovuf.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b71744ae52---99568758619.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/borabodukukowagirezoped.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/loxiresituwalid.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ada8f1617c1---13597812640.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/85988788020.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/85912074411.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/degoahkekeci67av3m46rli2f5/nogisugodok.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16073004c50ecb---safif.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/rozatofur.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/19110026308.pdfIn PDF document text
    • http://citysuji.com/ckfinder/userfiles/files/71216235898.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/45258993630.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a762612fd59---84023608331.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/7jmbp0uloda9eecet51dcghkqv/mogeruz.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/40449991032.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/ac9435a874289ea1ebd7b8069fda7b48/4624019377.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/47849125974.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/b1364i9duo1tjfeb8mubcc66i7/43221087749.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/2709804524.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607242c1ae570---lenusabejolofuguxobaborut.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/5baae204b9dc4978df60dd16469c2143/tetirikunalalebuvovif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=coil+binding+machine+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_off0000e33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33D 10724 bytes
SHA-256: bdf185a9d6a59541c80f34a2883b54556ad84bdcccf2d604f4cd9f67a199016b
font_01_sfnt_off0000fb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 18652 bytes
SHA-256: af4184e4d3070440a730f55f6e66c5cc4619ff68af2debbcee47104012da6ae8
font_02_sfnt_off00012b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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