Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25133033ccfc50d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-10 22:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f8a1233422c2fb4c0725a88d270078b9 SHA-1: 6c2f6edc64a16ee7abaafc6b5710aa23f55db3c4 SHA-256: a25133033ccfc50d7a18c40f8be99cd457bc9ee60cbd83fc3aa51205c7438d4e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://service-panev.com/userfiles/naleg.pdf In PDF document text
    • http://designbeginnings.com/upload/file/lirobudelibejapifixu.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612febf890e92---54524370327.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/75725416356.pdfIn PDF document text
    • https://miet.hu/kepek/bakobes.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/9060843453.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/gesabipevediwofonedaji.pdfIn PDF document text
    • http://islandpointfl.com/userimages/divipidup.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/71266041554.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/saxavezusezofazezemoletax.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161358832e3894---68563901827.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/mitesa.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/84427333281.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/97974457167.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6ac2ag7e2v554kgi8jvn72kb02/fifaxe.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/nabusubutabumufininus.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/wepemewoxoxeviroz.pdfIn PDF document text
    • https://interconformity.ro/images/file/golidifetavos.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/uhe4nebpo5ap9dg7ceqpejf2r2/desujazebu.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613249dadf4ef---45285116930.pdfIn PDF document text
    • http://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/72138040607.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/lagopovagelizez.pdfIn PDF document text
    • https://termoformat.md/img/files/44745452946.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/juzipijupigazagikewuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=raspberry+pi+internet+connection+monitorPDF 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_off0000d6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EC 10788 bytes
SHA-256: 489e889077ed6053b6111b874e35136a3dd807f99e7d117c70d9f057ef7cc945
font_01_sfnt_off0000ef9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 18220 bytes
SHA-256: 5ebf2be920a9c2a0f14f08147bf85775ab170fcf3dc84efbae15f084772644c7
font_02_sfnt_off00011e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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