Malicious PDF — malware analysis report

Static analysis result for SHA-256 b016579747c25073…

MALICIOUS

PDF

85.4 KB Created: 2021-09-19 23:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0e1e41420ecb1d33b0b46a9fe5c14847 SHA-1: 7d4e1c1b05e385de11960c540e6cf2621b977f0c SHA-256: b016579747c2507365795652ebce92a736e50d92da44edff97e64fcc9aa0ddfc
156 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 as malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. One URL, 'https://smidgel.ru/uplcv?utm_term=zelda+mod+apk', is particularly notable as it appears to be a UTM-term redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://smidgel.ru/uplcv?utm_term=zelda+mod+apk PDF link annotation
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f03d7364c0---32219983125.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/3eemckue3gfq9de8i2hbnabij3/viliwilalosulobedodom.pdfIn PDF document text
    • http://aa-nusd.jp/20240713869.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/52123209764.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/rifol.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/fagamumomunugikobapekis.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/zebemituvumilopudixulalu.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/popofozexevapu.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/logugazimarifajogubit.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16142d048252cf---51240502633.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/dagubowidugadasorane.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/90128506817.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/32491088087.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/58185291143.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/10008263580.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/70849792565.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/sifupoturutaguneruxowale.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/5342946070.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/befinawelewazezewifivo.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/66ed4f9c2dbc96ac0f57169e06c2fb8d/34806095241.pdfIn PDF document text
    • http://jsjxh.org/filespath/files/20210910025104.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/28938220360.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_off0000e9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C5 10044 bytes
SHA-256: 5a4757a9dcc9b48732888f1566a19b653a477f8337f57acc155b0456dc3c252f
font_01_sfnt_off00010015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10015 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11827 18648 bytes
SHA-256: 67a0bca8921bc401b8e81d095abb2b0e75fdffae3d7a8e223beb8952f99b0aac