Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ab53a6dc39fa0e…

MALICIOUS

PDF

70.6 KB Created: 2021-10-03 11:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 009ecad6e6e4040bbff29666882b4f36 SHA-1: 6b1696f602ed6602951cbda42fe729fee2273bb4 SHA-256: 16ab53a6dc39fa0ef3574d081435971e2448ac4677c52d9d3477fd1e649c9f30
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://crysiq.ru/uplcv?utm_term=after+knee+replacement PDF link annotation
    • https://inprovitperu.com/ckfinder/userfiles/files/20607453612.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/46384726477.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/20411627877.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210928200005.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161416da10bdff---86819705520.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/72701016018.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/witijowepizemib.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/sasurigov.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/fapojixifetazapiwof.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/fetuzuxuwekawisedusiwu.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/jokuvopagutuz.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/7310268371.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/1e72e1de99485c5baf9bf45ff57d21cc/53629031013.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/satelosomutov.pdfIn PDF document text
    • http://przybyszewski.org/image/file/lonalapifexiseremowuli.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/97386549775.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/13753048865.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/weviruwogona.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210923_1D460B68ECC7A74E.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/87900481483.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3ef2ec34c46732262bca9a8d6b5451f7/fupadapigorewela.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133debdef7ee---90583156593.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/nolujupomonirojukatiput.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-19/20210919181758737064.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/59172012162.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_off0000b533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB533 16340 bytes
SHA-256: 031bc57b820d110f29844b453ad5ec9b68f0c80d46ff688e3454a75f6a5fdee5
font_01_sfnt_off0000dd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6B 10336 bytes
SHA-256: ecaa659d2f8676e465b7aa2c1377f60949254fa5e168a536bae61563c8eb810d
font_02_sfnt_off0000f4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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