Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ac95e8c7cb1158…

MALICIOUS

PDF

77.8 KB Created: 2021-09-05 08:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5215b0b7631f269a256bb05013504051 SHA-1: 2bb0ffec024af76f23aff313cdaab5b70912d4bf SHA-256: c3ac95e8c7cb115830ced23cf5074dd7b10369d6f9a922d5882b108b36286bdb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the presence of external links points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160e607c910061---894112722.pdf In PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/66859367415.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/38966275454.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/pegatoxisujiluvalisa.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/60859177271.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/59979975375.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/7bb9d57d7a5cac92ee7e1927f32ed6a0/rosekizasalavijawaxizew.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/wimibusavixirin.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/3e8c7f5f16fc661d916a7cdc5bf13535/jugodejirim.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/mufizituzudedi.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/44387173238.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/833bc14a3d8c317d7c5fc2086fd1688d/lawajumojoporenagupemu.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/33aede0841f5fd9ebdaaaecdc1627f3f/raribelaziranadoxev.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ce3539bfa---tonudeten.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/48550887518.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/4263528510.pdfIn PDF document text
    • http://www.bash.cl/media/file/fegulapikijipulikoteb.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/zadatevonewel.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/91829151308.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/ac13828ab7e51522c1b091e1080d52bb/nenuxugobita.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/17182691517.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/vazutirafosuvedixerugilad.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/73121753771.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbde40534d---83711877614.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f3ae5559de8---leteloj.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10a8defe8f---61870399474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=converter+arquivo+xml+em+pdfPDF link annotation
    • 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_off0000c906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC906 10936 bytes
SHA-256: 20410e87f6da2f028d08cd7d3e29947ccc9ca71a305261ef5168e086d260b300
font_01_sfnt_off0000e228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE228 18288 bytes
SHA-256: 6d0560bf54a6d0583c5d976659c51885239fe52d33e09a52821b27207dc07cd7
font_02_sfnt_off000111c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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