Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d78a60be7203461…

MALICIOUS

PDF

80.2 KB Created: 2021-09-14 21:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6bb2d1e742e93ed5c1885ee2dc55376b SHA-1: cf0b0c82c0904f81648c3bc3bf82bae9b3426ddf SHA-256: 7d78a60be7203461664d0c84c518e9736bdc1275a38a6ef08539e59cb4dc1910
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://gradn.ru/uploades/fckeditorfile/21168577865.pdf In PDF document text
    • http://zzweien.com/d/files/vitav.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/faroniposinokiziwiruz.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090812583860.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/36166336645.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/wogajalulagobe.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/51864751369.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137cd0515140---69869582498.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613c721a04a7b---35305734174.pdfIn PDF document text
    • https://amgaa.org/temp/files/fadala.pdfIn PDF document text
    • http://planetamama.ru/files/file/58325767001.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/rodigisozapowi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s7cu787b805a3t3qgh9r7pmc81/79336865173.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dhn83tq19d29hbebsil10cenl3/wulurifu.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/8809301852.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/rilosunulokurawiwa.pdfIn PDF document text
    • https://baongochoa.com/upload/file/fufemaxipupedaf.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/10205797712.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/39414613601.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/32901128993.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/mipemogujedipanejuvobi.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/78003084049.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/95061032255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=download+ppsspp+gold+apk+2020PDF 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_off0000cd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7F 20652 bytes
SHA-256: 9ef8d0b8e9fc73c04a6b14ac152e3b8a45e1d66f8b93245c92117b89025cecf4
font_01_sfnt_off0001032c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032C 10564 bytes
SHA-256: 3b784a25d1e8f6474b0f6aa9368942c5da4ee501b7a070b69d0352d11e392d33
font_02_sfnt_off00011b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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