Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f03ebfc56e565fb…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 02:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6f26919d7b4600cfdc793c115bb7a540 SHA-1: a2f32300ad5104c563994a0066b8134daae0951b SHA-256: 3f03ebfc56e565fbadf43337ffcf5acac3e570e0408e5c52ba10e61627ab3673
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to domains identified as disposable or compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary indicators are the link farm behavior and the heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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
  • 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://gardens-spa.com/user_pict/file/rokafubazoxevaj.pdf In PDF document text
    • http://damosushipleasanthill.com/uploads/files/45819110827.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/nipatojuwipidogodipap.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109062245492250.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tupesedutidegefefu.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/madidaropenexeririj.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/xetozuxikoxibevaxu.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16139e3950b1d7---sogetefuxumurofek.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/58044503108.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ud2p101grhj42epmmorhgkghrq/34811972112.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/15449393238.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-12/20210912175058154897.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/45909264854.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/87377837281.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/50348335032.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/11773125803.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/51260465597.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/5370969329.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210911_BB89F767807707C5.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/pofemupegolotatafolezo.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/fegiwozutumevesi.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/efce408d341a9a961b13d06d456a7be3/13373938744.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/gusuvawanenegaseg.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa7d719cc2---96069682072.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/aae2df4ada0fd648111459cc5b5a030e/69061457743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=comment+regarder+la+tv+free+sur+androidPDF 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_off0000d460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD460 18264 bytes
SHA-256: 80ede53f4b3973fc20a4fef7714d6425daffcda8ba9c2548d6d0dbecc74a95dd
font_01_sfnt_off000103dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DC 10896 bytes
SHA-256: 6f1587b1aed01ae5101552876788fcf1d3b573bc3490934185b641cdd0a28aad
font_02_sfnt_off00011ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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