Malicious PDF — malware analysis report

Static analysis result for SHA-256 f820a8b5d85144b8…

MALICIOUS

PDF

88.1 KB Created: 2021-09-18 19:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 55e8228652ea2a005b8aa0f7d1459ca8 SHA-1: f11df54067b1415086c50cb8c4f3213f15ec2734 SHA-256: f820a8b5d85144b83ad78822a5f5167a95676c5bbb9da0b538dc8eb5e75913f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://drafthe.ru/uplcv?utm_term=ufo+vpn+fast+proxy+mod+apk PDF link annotation
    • https://daaeportrett.no/upload/file/61893919465.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/59169794759.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/gemudupudupesofemowazemuw.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/84130099891.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/komed.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f94f56b55e---6486117091.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/e81tikret810jtvddc4m5cir3o/84420987708.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130868eb50fb---xinonasuzejobinur.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/siwusun.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/jasubugowe.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/179be8602ee054677d2937995fde4be5.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/041332068084.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/fabezetinadirege.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613eacb64c7e7---buzoridixo.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/1182984002.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/kalovalipebogekaziriwu.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/0375bea22e8fa3a520d3a108c64c6bef/82882753485.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/jcumg7cael9gnqb8toavc3ggej/tetaximekaganubofinexopuv.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/69770822545.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/bf0c41e28706461517c9f17bb594ed39/17114732274.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/naxeloxowirusafafaso.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133b9f6defc3---82143603468.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/kobefop.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/mamosiduwidag.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_off0000ef00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 19452 bytes
SHA-256: e181ad30fc57de3ee6a92b8f2df9521afb25dbf009fd7726ed8c3afde89dded0
font_01_sfnt_off00012217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12217 10768 bytes
SHA-256: efc446fab920a9d8c7c142de190904eb527836efe0792a8c8eea80d01f43088a
font_02_sfnt_off00013af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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