Malicious PDF — malware analysis report

Static analysis result for SHA-256 2612ad0fbe3641a2…

MALICIOUS

PDF

81.0 KB Created: 2021-09-09 09:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f52bf936021c9b891331207586d2a01a SHA-1: c4c1f23caa69566237a6fb2040985b033f013ff9 SHA-256: 2612ad0fbe3641a25bfa9c7ae5c99ca410ebaae0c594cd4f7431c3e8e8850cc1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gymlesgeants.com/upload/editor/file/puzuxo.pdf In PDF document text
    • http://bestbelly.org/content/files/files/vafimajusudizojirixeligow.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/22316459103.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135f1c2a875a---pemosebabameluwosuxed.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2cfdc7dc---pagisabax.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210909140048.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/puwilumuvijesofa.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/61938057416.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/siwerebal.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/02f1435ad5652bdf1280e9d2f9427645/20195967703.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/fejesuwutitosaworogujol.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/50805028558.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/foliki.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/jivexefibuzozipeg.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/kesanikuzevujokasitiv.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/14399578919.pdfIn PDF document text
    • http://alltechsro.cz/files/74526257697.pdfIn PDF document text
    • http://castel.lu/userfiles/files/fogiwulubanovatikoxil.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/15833340478.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/gotiwololamakosago.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/matibukiva.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/47827140377.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/17953368563.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/72184982565.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/dopezekuwamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=malayalam+movie+torrentPDF 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_off0000d990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD990 10276 bytes
SHA-256: 00f51a459b5105273df0ee1a6ca5024120f7658ac71221ca9ee6ecec5122a76a
font_01_sfnt_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 17364 bytes
SHA-256: 270a1f14261fdd899bc2e9769a9ade0eb3282ad0efadd11328a9f7bd95d6e5a3
font_02_sfnt_off00011e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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