Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e611f951acf7487…

MALICIOUS

PDF

73.2 KB Created: 2021-09-05 22:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6fd9ebb0718aa87c80f7bcdb3846704f SHA-1: 77ca4e8fcf086de91dd4db54364444c27accd496 SHA-256: 7e611f951acf7487a7d9a1830ac0cab85594e28ac496747ad62301dc8afe1987
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous URLs on potentially compromised or disposable domains. These links likely lead to further malicious content or phishing pages, aiming to deceive the user into downloading additional malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://kme.pl/global/app/webroot/uploads/file/16306895132361.pdf In PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9155aeabe2---14011191742.pdfIn PDF document text
    • https://scriptdd.com/_file/file/42779524847.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afa61f46019---sugubafume.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b4db8588d7b4a82df3ab6f414a8044a/wileriworati.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/71248648395.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/72738097486.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210801_000241.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210813165310.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/498012506.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/68s462h75t7h4sjdtcv4pnbrer/78095669387.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/mujazodugomagovudiw.pdfIn PDF document text
    • http://imbirimbir.ru/files/wosenenikopebarelarenez.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/faa5e14a9a8af55c822bbbb727d825f8/27916205298.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/62505165258.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/masatabajobofobubogigaja.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/1513b746fedae7146632c78311c8dbff/892939372.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021072618253673499.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/vifuxu.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9b797ee97---80956620078.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/4tbcu49ttvgqg9hc1hktintps6/25671965077.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/7e92457bfb6b468d505c8c802dce15b8/49362162016.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/54605d035fb6d6fddc303ff12fbbbc29/73199564469.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/72280881658.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/t9nmsggqclfckeb48hd9dvu934/71516651761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=options+futures+and+other+derivatives+solution+manual+pdfPDF 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_off0000b91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB91C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD133 10952 bytes
SHA-256: 40e0557474e30ad52b17fe26f4e8afb2453ee420a8cd569a3c66d892d74d2670
font_02_sfnt_off0000ea6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6C 17184 bytes
SHA-256: d94bf5d5ca0b2855fe7ee2c358aad12ff1e817dbbb53fcbd81d337c01fbd1b2e