Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2899c6ad4cdd2fd…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 14:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ea4f4b01979bbca96e626aa3489a16c3 SHA-1: 985f7fd1003fd5509f1a090bddadd39ddecf2250 SHA-256: c2899c6ad4cdd2fd7df4524432157cf6d2671d9b7e02a8787ab7f2b092ac74ca
276 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It employs social engineering tactics, specifically a 'ClickFix' lure, to prompt users to execute commands directly, likely to download and run a secondary payload. The document also contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a link farm or distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/19fnslb9lggn3dvs72e766og0u/66854772922.pdf In PDF document text
    • https://mfdesign.hu/files/file/12632418399.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/90220458198.pdfIn PDF document text
    • http://kgmda.com/upload/files/47413911500.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/48829208424.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/samudeximojakijositipi.pdfIn PDF document text
    • https://susta.vn/userfiles/file/61459253576.pdfIn PDF document text
    • http://vejwun.cz/images/fapilikabukupigosupatu.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/je9tmarfveed45brd6io8o1arr/supifejinejurosero.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887038ea292---68492082750.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3e1498c0af---76393552351.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/lopezapewixix.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/bekiwazedajiwe.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/vv0a1bbqp57h9c7f0fn2ud23e3/dupozesowutig.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af403c00f13---mowupixukigumadaj.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4d8d96654---63795961720.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/vusowipipovow.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/d286e54b408c2ecd9b91580b74593cd9/xefuxawukelidufifebodotu.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/11819404679.pdfIn PDF document text
    • http://girl0229960192.com/upload/users/files/28426383017.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/33070458258.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/5cb4a042fdc2883ec0db7702360ddbca/sijukevodulajezular.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/revafol.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a87a794c68---9081967286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=edit+pdf+files+freeware+windowsPDF 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_off0000ddfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFC 18176 bytes
SHA-256: ce73a851e5eaeb5e5c9917cefb9aca24de7107e3cdd63dedc8729f4508307f7e
font_01_sfnt_off00010dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD8 10560 bytes
SHA-256: 960207a7837ffc28b59b0cefce540c117b86d18ac70f0ea54524e85778909a41
font_02_sfnt_off00012617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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