Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58b42f5799bf6be…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 01:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b82724063611d317c19dbc7ce5a1029 SHA-1: 1e226cf9b4f0ed48353eeff290d253530c9d9cae SHA-256: f58b42f5799bf6bedc85fbb63bf4c8b2e11375609e62692c7703b308615c2b8d
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that lead to other PDF files hosted on various domains, likely to obscure the final malicious destination. The presence of a 'download button' heuristic further suggests a lure to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://kamkmori.cz/ckfinder/userfiles/files/fajofatebudikemidufenobe.pdf In PDF document text
    • https://conexkarvan.com/cache/fck_files/file/riguzopupofidukar.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/gavukotutukenodegomuwuj.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa3f624c3---45533661995.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/zawidizoludebekope.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f736ac501---vavivejomomupikotuxodi.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/88fb52eb91b5a8b87328088354c136a4/gekotekitifawotipize.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/govalel.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/96577988363.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/75196790039.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/tudijubibafifatuxenoxonaz.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/41907332906.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/gosomasawaf.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/235258291.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/rawonovikitorurejinalebe.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/26659217398.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/bosinepep.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/konutasalav.pdfIn PDF document text
    • http://rayer.cn/d/files/wapiwavafadota.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/20301696775.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/tufofolemomunezamepiponep.pdfIn PDF document text
    • https://morabia.fi/images/file/giwiwikerukixiwelesuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=clash+of+clans+unlimited+troops+hack+download+apkPDF 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_off0000e220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA32 17316 bytes
SHA-256: 04a83f584234c5a67a0b661709986f7c52164a1240ffa9d480794d93fddf9c94
font_02_sfnt_off000126be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BE 11192 bytes
SHA-256: dd90f7e490e1adca8bd828dd33bb4aeda160bfbf21be018325be0937d8570d09

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