Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc2646623296d66…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 15:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 62aeba014ddd8a9f7b1c2a8ce4516d2a SHA-1: d6709112addd7dd48994ee4ec8a41c40d18a11e9 SHA-256: efc2646623296d669a27bd9095f83206c9fdeb26930f5ba4e38dfb6eac53b25f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics as containing a link farm and pointing to compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7d0eded61d462301c1574446764dbe55/sirafab.pdf In PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/0n2d4cf4f38bi59l7r2k2q469n/nosonipupoj.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d7cee5ab0---29050811607.pdfIn PDF document text
    • https://alutat.com/data/file/zoxadamitiwolevap.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/jenenaguj.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/begalisezaxasizasoti.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/28076212797.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/snmvm6ib8dmnirtcl0erlii5f3/nolanuv.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160989f9559854---nenalegutikatiwanufanab.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/83782514009.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/90766261396.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/tazediziw.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/9400981608.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/paxorolazetepilolawomu.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/oqnbnbu8ul14nofn5q41hva8sv/tutofiposarenuwawa.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134bd4b24005---23730004770.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/penizefakopile.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16c3abb0d---80154064437.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/9omndi77ofej2bcthoc86ruoij/jobokaxoforuxotiwifaxe.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/61012349928.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/15086874517.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/zejitulubula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=autocad+tutorial+architecture+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000defa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70C 19228 bytes
SHA-256: 20275b05e3169eff5ffcd13e9c290b83feab0d2b9697ca3e93e04ca766b2486a
font_02_sfnt_off0001290a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290A 10528 bytes
SHA-256: 8030ba4e55b3ed2a0c13b8436b280a415ab57844564428740a8efdeb6e46dde5

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