Malicious PDF — malware analysis report

Static analysis result for SHA-256 881101c62ec43442…

MALICIOUS

PDF

89.7 KB Created: 2021-09-19 00:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e1c76b3868f7cc505ee20c334a35657b SHA-1: 8159babfdece10f3413855016b94259b76eb43dc SHA-256: 881101c62ec434424ddff06fdf766e6790674b02239a1c2b98c39b98a3c27c01
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=stick+war+legacy+mod+star+wars PDF link annotation
    • http://goldenstarhotel.vn/images/uploads/files/zakoxal.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/21168481012.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/xijusogalagatilenapako.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/14980672692.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139445b835df---20322669770.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/65751504132.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/nalozawakigogutuwivat.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/nawawebixojileb.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/67230937267.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff61beb94e---93506889208.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/nadivemujanuwukira.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/9903877834.pdfIn PDF document text
    • https://asiapharma.la/files/files/91263986432.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139db62de26c---kufofebuze.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/16511898720.pdfIn PDF document text
    • http://stonebreaker.at/81903604929.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344d0a9e181---sisobetebuzaxa.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/b52c6280c2854304662bb7c7ebbe771d/37959048627.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/56956148561.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/66270464685.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/38477164157.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_off0000e24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24F 17428 bytes
SHA-256: b43b9cf21f1f9f47513998798509aa21b66dab16d843ad7e11d706f186b593ae
font_01_sfnt_off00010f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F44 10976 bytes
SHA-256: 89be165012e0e702502cbf5946485af79381d57e1fdfc6276a5b8d42998f19c9
font_02_sfnt_off000128a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A2 16836 bytes
SHA-256: 211097b55cbf1985c25d6955e8b04dca157948ab56e2a5568b5bc4f37b63821b
font_03_sfnt_off000140e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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