Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4425483cf2a517…

MALICIOUS

PDF

76.7 KB Created: 2021-09-19 10:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 37310091f4ece6522069c5eb635aae3c SHA-1: a8c7d34581dc3168b0751b2a815fdc5098e5cf75 SHA-256: ed4425483cf2a5176f5a6f67b4d1869589ee38191ac0198c6ad45f2cfb1864c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://photojet.bg/userfiles/file/96813779338.pdf In PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/91242477873.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/mapisejevonifukoluvinuz.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/wedivufimaramutavumolixu.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/luvorelidawor.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614554ee7e23c---26993017181.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/vepisixopi.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/zazinavikevuleso.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kixixikemekasegipibiku.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/27c9f5a6132507bfe0a7a8c7fd3a0c0a/70007424195.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/50561628516.pdfIn PDF document text
    • http://www.og2c.com/images/file/56612886297.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/6161039882.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/55248868723.pdfIn PDF document text
    • http://packturf.fr/files/92783285803.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/36282854368.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f5c61b39b---50240932982.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420750b790c---55553313490.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/lusisu.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/10408803853.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/37003473180.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/mivajulopazasarasomi.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161376d5f9206a---94962260656.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/45176242355.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/29781539252.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/nukatizuzakodutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tera+yaar+hoon+main+mp3+song+download+pagalworld+mp4PDF 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_off0000c22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC22F 11156 bytes
SHA-256: d921766d93cbe664cff7007ef4efd0c7ebe4329e97beee050a00e624d72f6a62
font_01_sfnt_off0000dbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF1 18524 bytes
SHA-256: d4df96a87cf90d6b8ba89f67fb309275d91cb994d5bdc0edbc7ee8007a76243f
font_02_sfnt_off00010c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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