Malicious PDF — malware analysis report

Static analysis result for SHA-256 10523f7ddb25a319…

MALICIOUS

PDF

87.7 KB Created: 2021-09-19 09:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c9e667cda8409fe739c71fa22242b455 SHA-1: 3bc424c2216e558ecf378e54176504a9e5248a42 SHA-256: 10523f7ddb25a319742bf4a63c9d6165b119aab3c8a9bc7aa2f577990ae53280
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript (T1059.007) is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=how+to+download+dragon+ball+z+games+for+android PDF link annotation
    • http://bischofs-scheune.de/userfiles/file/16115767846.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/lisomamatama.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/78017017228.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/20642720920.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/lesivagiximotak.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///3562167864.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/95295916948.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/dizajunixoduseve.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7a91eafcb---21405906808.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16141660e8d8b0---babujijelijizojowiler.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/gufogiveluji.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/fapeporoso.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/garavesozufalusobagixakam.pdfIn PDF document text
    • http://moretonassets.net/userfiles/95559953125.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/83086691734.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/nilanaga.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/medoxafesijade.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/8d5836b1de3d5ea2fffee72f9fd0aa7a.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136472459cfa---46599206153.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/kajuxavede.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/kijik.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/56018908401.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/vemofujotefuxekitilalak.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_off0000e4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EF 22020 bytes
SHA-256: 336e3aa6f9b76027fa90532ca9ba4540f465d319e7b01998691c4a22ff13f242
font_01_sfnt_off00011f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F51 10972 bytes
SHA-256: 1ebf99eae057e6473e6c3e3c06b1bb2725993415db666a29dba7f89b32ac9488
font_02_sfnt_off000138a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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