Malicious PDF — malware analysis report

Static analysis result for SHA-256 6077fe63e2d7db79…

MALICIOUS

PDF

116.9 KB Created: 2021-09-03 04:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c1e24c95d920b9a9cc67b208d153ee9c SHA-1: c8138ba7467715ba9e62056739ee9bbeab71422b SHA-256: 6077fe63e2d7db79eb9da7790c479e80e97948077ac214615b2a45ab53abec16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=local+environmental+issues+pdf PDF link annotation
    • https://egc.ecrom.work/syo/files/pegerogujijufiginipejus.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ov3om3qpkb7jfev2kkpbv4r815/nelugagufaweludotute.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/54345096193.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/damedup.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c176442bd3e---ragovevupulugunirizem.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/85321907605.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b83760000c6---95303327368.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/5l3ovc403v68im68pqjid9i21k/5624565566.pdfIn PDF document text
    • http://beta-rc.com/upload/files/kopuwuvuxufotikiboma.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/fupepotuzizezeti.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ba52d7c30a4---37858169845.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/cnfcat8hn154srim3g0n10usqp/rafavuramojapumenute.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/lotaropikesuvi.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/pititozudujul.pdfIn PDF document text
    • https://ms02bet.com/contents//files/62746917611.pdfIn PDF document text
    • https://topupdana.com/contents/files/dunikuzodipodono.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109782c8117e---sufipawa.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/zopafebaxeb.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cc3686015---26047409335.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/74744922927.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/zuxijoturukovedabajiwafav.pdfIn PDF document text
    • http://scriptonica.ru/files/files/pasulodasulamer.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/ziwikazavomeguxox.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/29d46a6b05758a6f31498557bf67c8dc/9855423625.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_off0001648b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1648B 10904 bytes
SHA-256: b3650f566e9d526c27ea2d029c0d061bebb84e074461120a53ca2441d7bed5ed
font_01_sfnt_off00017dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DCB 18320 bytes
SHA-256: 9c422a56a50c2c23ec36549231868b25aa05506b304b3e09e714010b1e675d04
font_02_sfnt_off0001ada6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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