Malicious PDF — malware analysis report

Static analysis result for SHA-256 931f0c455ae2e1cc…

MALICIOUS

PDF

76.0 KB Created: 2021-09-25 19:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0dd33dc0f93d07258103185e421481db SHA-1: 40442c70ee8c58d1f3083102d512976cff291d37 SHA-256: 931f0c455ae2e1ccf2d8fba1b4f1cf01e12f4a6e5b34a02d05b33e43040c925b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 https://coretry.ru/uplcv?utm_term=mektoub+my+love+full+movie+online PDF link annotation
    • http://winkeleninzundert.nl/uploadimages/files/78036252415.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/mofomobug.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/05bfee4bb8cea5961007dbfc72671191/77621185568.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/10338638594.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/7cd3b865ca51e9d888558515feb25b94/92016939537.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc69926d10---nenimaluxowudofusuf.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d95fc3e217---jopurewevuvunowexix.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/meres.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a37bcdb0b2---19311561436.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/8274674322.pdfIn PDF document text
    • http://scpt.it/userfiles/files/97898153827.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/jaxuparatujosizarafa.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/57713930623.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/gakevakeravowogitaneru.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/68553918945.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5smvh4vgbgu19s9ibi2bntkb96/gozekixon.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/fevimenekawowusu.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/dikaviwil.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/zipuzumexibutepewuru.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/34612673131.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/35372779332.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/10568568929.pdfIn PDF document text
    • http://liily.jp/upload/file/20210908075259.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC964 16632 bytes
SHA-256: e896d0c9c6509c93731645541c0836c845742b74f7fde2e8ff5e94baacc6a6a0
font_02_sfnt_off0000e0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F6 10452 bytes
SHA-256: 2d89dd86e6f3f48428bdb480d2853d602e64167da556a03637a011aeea30c006
font_03_sfnt_off0000f8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AB 16360 bytes
SHA-256: 20532fc281c4acf700ca599532c60bc4b7477196285175ecf384c0afd697513c

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