Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c5e15cdc75e621…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 04:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d6814fc0a1076e8c428b20baf29b3fcf SHA-1: 6d0622c41ab17a5ed0597f4a68808208246a4506 SHA-256: 35c5e15cdc75e621482737a8ce635a88196dce6cff321f2fe93ce1ff216ea697
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=android+10+guide PDF link annotation
    • http://theponghop.com/upload/files/nizerupup.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/gapuwibakumozav.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/76300776110.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210913085351.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/mozusegoxiseluniv.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/27311539456.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/polose.pdfIn PDF document text
    • http://cyuansheng.com/userfiles/file/68726315251.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613341697b5a9---42501612801.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/sakoroganedelegir.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/13598046629.pdfIn PDF document text
    • http://leguido.net/files/16503524440.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/20296000820.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1afa8adcc---bokakenomeximopaju.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/79423594031.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/qrhghkbh6ri7ighp2bogvph2h9/1763860989.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/10095876243.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/34834895030.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/kusubefazatojozapeke.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/77719917508.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/lasavoxazoxeduxi.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/zuzunerujuwamasamikutiji.pdfIn PDF document text
    • https://123natura.com/stockages/files/zufirezewid.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_off0000e689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE689 10204 bytes
SHA-256: 86472698bf2b8af1103a5e271179766689221cf92567cb06fd7eb78a96c7720f
font_01_sfnt_off0000fd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD46 17296 bytes
SHA-256: 0c5d7746e24245df4e6f337564a7db448d41b1d24d0661a3d9b63a4de5e6eb7b
font_02_sfnt_off000129df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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