Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4fae6e024cfc19…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 10:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6728e677f3058f201e55bb0013a66911 SHA-1: df66604723ee518e9fed56b9c3f5f00f36300782 SHA-256: cc4fae6e024cfc19f183624a379703c68c868ebc80d12be0f28bc365c0ce8e36
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • 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://laborke.ru/uplcv?utm_term=convert+jpg+pdf+online+gratis PDF link annotation
    • https://ndmoyun.com/calisma2/files/uploads/91542690839.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/18040485513.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcf7c4519a---topifijunimaxodapirimur.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o8lcvk2lqvrqdjqij6df225mu7/jonovoximiwizegatavuse.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/suzaturawu.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fbf8bf6db---widedinatuka.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/6lpdd17ou8717puhrmnehpsf5f/43396032209.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/33529041230.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/psv7ovflk6bt8in0tir1f78hir/19896238388.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608141050b4c7---tunajarig.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e7f17776d76---xakejimenirunorug.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/pibomiposaxe.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160751e5194ab4---zesupiv.pdfIn PDF document text
    • https://istanajp2.com/contents//files/40280958709.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/parugazeviloxisuzedeg.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/bexodegada.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/80160553012.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/wusadunovalamus.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11281943925.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/0009c23c99e10265fa4d89d891a18b50/wufigigelusegur.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611aed8342145---texikekujet.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210821_0052511E1A15A9FB.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/20381131128.pdfIn PDF document text
    • 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_off0000d878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD878 17552 bytes
SHA-256: 5f879d25b3861b4b48c5b530155217ba106ff0f6b41aab84b335bf1b141e9219
font_01_sfnt_off000105b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCB 10900 bytes
SHA-256: 8a8718181ece2137b21843cfef768ca586f2aedf5306c0fa841d41fc7046dccd

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