Malicious PDF — malware analysis report

Static analysis result for SHA-256 21cfcaa5c70651e8…

MALICIOUS

PDF

88.7 KB Created: 2021-07-23 13:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c409947589cb3a50c4aa1d073465fb61 SHA-1: 4b7278d5aa758391e70dc51c2debf5de754048ab SHA-256: 21cfcaa5c70651e8ea1211ff1c67af512d5485bee23ce2df8284fb0131389324
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://bettekingproductions.com/clients/874300/File/magojobasarevus.pdf In PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/63f352a92fae70d0135f5ba7d83831f5/19439512506.pdfIn PDF document text
    • http://coffee33.ru/archive/file/58467473267.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607814411e59c---rupejuni.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/3vt6cefh72719u727badj22rq3/83277828673.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/55571763156.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609253e543f9b---tegasufuz.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ahech12r1n2ltpqgki677hed02/pepamoto.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/7b874972e7a31f6dcf13db5982d45f90/zatizip.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8510274a8---vutodofotizakuriked.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/32e454084ac8b6424a80608cd73d889a/paridivimefobonuna.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fcf899f5d---63099146000.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afb3ee60b6a---fowuwupawaxupuwotelofow.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bff6999d230---35693433282.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/35321101011.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/zifenizaludevuxavijuluduw.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/fd959ce0a4c1e9af9fffb6ee4497e42e/54058658284.pdfIn PDF document text
    • http://metall-press.ru/files/76647301818.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/gosematite.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/fatogaxekiremenagazix.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/patameligib.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c887a2b3a63---natejira.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609528203b055---21974679390.pdfIn PDF document text
    • https://fallsplat.se/file/31729095655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=manualidades+navide%C3%B1as+con+palitos+de+helados+para+ni%C3%B1osPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E8 17884 bytes
SHA-256: e796f45abc4554f1c313620951010fd3b77fe01ef62188012d417cfab0a822a1
font_01_sfnt_off00011fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCF 10976 bytes
SHA-256: 53a7b8ba9b1133b66d8b7e3feb92aa07a01c3ddbeb3fe3805a3598ddaafad70b
font_02_sfnt_off000138fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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