Malicious PDF — malware analysis report

Static analysis result for SHA-256 885993b04d736fd4…

MALICIOUS

PDF

73.7 KB Created: 2021-09-29 08:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7393f8cb436d31d46177dcf0b46df4bd SHA-1: 70fc040e6942e15930e289b574bb1a53ea82323b SHA-256: 885993b04d736fd4cbb47cb9cce53604cb7163b78c330eb10f8e467ac2f5801a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=among+us+hacks+real PDF link annotation
    • http://prestinoequitacion.com/imagenes/upload/files/51290461026.pdfIn PDF document text
    • https://shevian.com/images/file/76255045075.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/lejeb.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091417375228.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/88956223737.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/jusabusivudu.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/zegowisorako.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/rapefifanudatutamolafurok.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/soropejubijuxisazopuso.pdfIn PDF document text
    • http://metabolit.ru/files/file/83670579750.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///61093296477.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/pujotej.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109091252021038.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133d6ea50916---kedunebutinoparek.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/249f6e6b6ebc16a84d396c391ddda863/gagukamekej.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16144154881e1d---kuzotixawaso.pdfIn PDF document text
    • http://kodemari.info/data/files/besupurusili.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/67085701480.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/46897346159.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161322d6482429---timaxafasanokikar.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/97337486456.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/bipinutupejomenida.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/39010810633.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_off0000b881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB881 10660 bytes
SHA-256: a3d95f4449079be29377ce147da0331efaa663aa90a3a3cabb0a4149817e926e
font_01_sfnt_off0000d0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CB 18904 bytes
SHA-256: 266739ed1a04a9112b768d7d12ca807e3146d9ebf619bba5b0efebc6bc184cb6
font_02_sfnt_off00010156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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