Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1463689fc7c69c…

MALICIOUS

PDF

88.2 KB Created: 2021-09-11 21:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7bcc9e43c039aa120ba2665c22c152ed SHA-1: 66a9e5307831f7f346d0bd94a919cd9641d8ba9e SHA-256: 4a1463689fc7c69ce5c75a107368a92917575dc124a3107c59a1a740069c1bc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://solucionaesp.com/ckfinder/userfiles/files/bidaku.pdf In PDF document text
    • http://teusz.pl/UserFiles/file/xebanalorejeponosizat.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d565aba37---78845775650.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/81652539896.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/garadevexedilurinutiso.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/15208310964.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/87571181749.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/69484955832.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/89819101134.pdfIn PDF document text
    • http://autovoda.ru/upload/files/9447634229.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/luxazomunavesasuxi.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/66048899518.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/724df084141a103c69ce2ae8c67461ec/xokokugomatowizagepabidaz.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/71069468741.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/75574982505.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/3e2deeff3dd8669cee9822cb4a0347cc/zimeg.pdfIn PDF document text
    • https://tdfstore.it/file/wizifewug.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/90371971634.pdfIn PDF document text
    • http://tzsunup.com/upload/vevunoginevojomedimideloz.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/30448143591.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/podirumobupiziferedu.pdfIn PDF document text
    • http://kammed.com/userfiles/file/88609751417.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/dumerakupagoloxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=hanuman+bhajan+lyrics+in+englishPDF 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_off0000eec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC5 19924 bytes
SHA-256: cdc0c66b79217afff26804094d388f8fc3c22aa101c97a961470df5f2dc0ca85
font_01_sfnt_off0001219a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219A 10936 bytes
SHA-256: 8ba0976f3a7bbacc106e60aee93c9ea72693cff2db74f27f044b2994be9821f8
font_02_sfnt_off00013a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1