Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4a167b75018eb6…

MALICIOUS

PDF

63.6 KB Created: 2021-09-01 04:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: ae95461e14b9485e337a21b732cd8bdc SHA-1: 34f49d7331ce5ec0da5eeeb27ff8c0a24a316476 SHA-256: 7b4a167b75018eb6e71c73faaf635d9fe1fef5d1a042a3af432ffe5c09ad9ffb
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that lead to various websites, including those hosted on compromised WordPress uploads. The primary purpose appears to be directing users to potentially malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7489

Heuristics 5

  • 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
  • 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://gruaszarate.com/ckfinder/userfiles/files/22194450573.pdf In PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/fekiv.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/nufatoruvozojanutupewisa.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/35066462972.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/wenepabigasinuzezuzefo.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/73981531703.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/fb406de6209cfbe0b397c0767e51758f/29004260427.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/49819622556.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d55966a8e5a---tupegadiberafat.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210510/210510083605961754nl9hmpk8eiwb.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/litafakipufa.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/40970d78d7eb2189f74588c7988e7137/zabeludikigola.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/kawegobetopesonotidakizi.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/riwedisoza.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/tesovonakat.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086a15073737---palavawupima.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/5546287479.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/72525792147.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f8dad86a78b---55317004164.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080d7654d881---sofijajagabaduk.pdfIn PDF document text
    • http://www.520amis.com/upload/files/7079728480.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/364056257.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/3563a6dc3ede2d2382010bdec8eb99d4/14513579790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=evaluating+composition+of+functionsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE35 16128 bytes
SHA-256: 6f0fb1946607dd96ff982f3b0c07c60716d46a549d54fde581217fe9937155c4
font_01_sfnt_off0000e783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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