Malicious PDF — malware analysis report

Static analysis result for SHA-256 85fcbfee07b5b4b8…

MALICIOUS

PDF

89.7 KB Created: 2021-09-23 00:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cdff3a859d29313aa5f8d5fff9b2cb95 SHA-1: e647d738c919e93a45bf9f9d718509a72b095081 SHA-256: 85fcbfee07b5b4b81415dd621000f2ccb6eacd98836a3862b8182dcc1df5aca9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, forming a link farm. The heuristic 'SE_INVOICE_LURE' suggests the document's content is intended to trick users into clicking these links, likely for phishing or malware distribution. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://heydarbaba.org/resimler/files/79259171520.pdf In PDF document text
    • http://szguilong.com/userfiles/files/94119215948.pdfIn PDF document text
    • http://trivio.it/userfiles/files/lurefumejivanirabojovapu.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/mavubujukomemogeludig.pdfIn PDF document text
    • https://longhoang.vn/upload/files/tarirofesojekepuf.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/newogewusaremolotis.pdfIn PDF document text
    • http://djpress.pl/Image/files/44488099923.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/9351615652.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/mujulopanadeninogatufov.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/pebazivav.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/32700045808.pdfIn PDF document text
    • http://huntland.hu/upload/file/filumorekegafaxoxuwiwosa.pdfIn PDF document text
    • http://minhanh.com/files/77267470502.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408906551cb---91591036679.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/wijalogurodenepovex.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/vumonuw.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613493ff45aa1---nojaxobufu.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/f1625c9932d3857ba78235bb04375b1f/zevifozikor.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/59444018322.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/rumazogipiletefabarorobez.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614076440bd26---84328215435.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/tifoziva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sen+cal+kapimi+ep+1+eng+subPDF 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_off0000f85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85A 19216 bytes
SHA-256: f206529e2ea23d52a30cd072c98cb113a14b6fcbb55916d2a944d3649c3cbc49
font_01_sfnt_off0001289b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289B 10856 bytes
SHA-256: 15dfa42d7f90eb9f84302fb4dbf4a72d625c804bd16b2bf58e3f532908e26c87
font_02_sfnt_off00014175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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