Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62c74ca21d5edb4…

MALICIOUS

PDF

71.3 KB Created: 2021-09-13 11:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bff3832424d5c43905f74b2b9ee8cd45 SHA-1: e3ce0d94a9a1f6eea06893eca9658b2851438f5f SHA-256: d62c74ca21d5edb4a2a7f783f9720e6bfb88dc3223bd539a9c86acb3d1d22504
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external links, including those pointing to compromised CMS uploads and disposable hosting, suggests a link farm designed to redirect users to malicious content. The 'SE_DOWNLOAD_BUTTON' heuristic further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=internet+download+manager+the+fastest+download+accelerator PDF link annotation
    • http://chandigarhdatarecovery.com/files/file/namezunifezonekoki.pdfIn PDF document text
    • https://sanagustin.cl/files/56140578646.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/zopebaxalinimopojag.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/soviduwepadafupekoma.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/lamubefefisofer.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/nibuvifo.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/5c4b694123acb35a175f56a2d5335390/29086323757.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/bipiguwa.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/vinig.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/xajujisaxapubo.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/89351017073.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/40816291879.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/20166053540.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/68577211917.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/rurowobixezo.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/97084493388.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/58386550906.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/pujidasunidizegarum.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/1313442055613d42f28cf1a.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/82141828586.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/161322f808dd96---14255731439.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/2e84354bed5bc4bb64fe16f4ab62cc77/45738497685.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/rukuwodefajuwom.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613a754dae1f0---fifemu.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_off0000b433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB433 16556 bytes
SHA-256: 33283ce93b5b5b2650bf767a6a6cdc087fd46f62c4b857dd3ddf3b4ee83d7de3
font_01_sfnt_off0000de46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65D 10868 bytes
SHA-256: 90d0c0c60a2da05853d804c6eed390cde71392fd482171ce8968d51c9d672051

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