Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1a7f759264fbe6…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 12:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aaad65a6aa0110e147123b9df4de9b94 SHA-1: 9ead6cec7d2e4445aab08ed1596fcdcdda7df222 SHA-256: 9c1a7f759264fbe6668f43ce54d955c8f956704fd7a6f4b03390e4b359388055
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's part of a link farm designed to distribute malicious files. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

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://cp-tournament.org/ckfinder/userfiles/files/bopokidotazexawezamu.pdf In PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161478d8218b75---gevozujumovisivapuz.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/kimiripokiwawanidemapuwo.pdfIn PDF document text
    • http://viorina-deko.com/images/file/jogejumesubeworulowomudu.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/e9028c1f652fb76e52be24076b8a3c27/8398210663.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/parikinofuvosifojebasun.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/6752091504.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210913_050055_133.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d791d24601---42185151055.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/nowedawapusomaro.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/72764309869.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/wubotuwitoned.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/36029396765.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613960eaa4fd7---17925133529.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d09140b089---65384233547.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/90985250652.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/rugasanuwenoworezi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ce7f1dadb0d213de2124bf1d9e82c5a9/kazomegojelixe.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ar7a7ucnjqm5ud0u5i61jjt98c/vumafudutodipixerure.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/kixafazo.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/12141892614.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/guxitazanibawomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=c+guitar+tabPDF 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_off0000de43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE43 9984 bytes
SHA-256: f5b82988de78c62794b5672245571a49cf086e6525a076e4313ef5b86ce1aa4d
font_01_sfnt_off0000f486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF486 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C98 18268 bytes
SHA-256: b7b08135f49d4f009644cbe7b827d04df7d462a3ca02eb2ce2ae66096f511542