Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d2232a11f908e9d…

MALICIOUS

PDF

134.6 KB Created: 2021-08-03 09:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 222c24f01a291d24dcdf7db9ab9e2c74 SHA-1: b5943944fc9813e29de483002cbcb1e17c296e93 SHA-256: 7d2232a11f908e9dc442b6183aac67e838222780a52ef3acecd25bd3dce20ce5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm used for SEO poisoning or phishing. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection names point towards a phishing or malicious content delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://chinoboxingclub.com/clients/36032/File/49278418502.pdf In PDF document text
    • http://songhandiban.com/uploadfile/file/2021072419301573499.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/balowakikasimaxamobifixep.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edab63e529e---66278168911.pdfIn PDF document text
    • https://dhesient.com/media/47648010638.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7d85e8d1e---83068836665.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dad667cf96---silatejiwugodunarel.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/77841096067.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcaa70ef6d---sololubawatokuwuwoxudako.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/19920055600.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/iclvhbd0shb86a99amkndk22r3/40299528288.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e4b1df211---misuxunezipabisisanevo.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/18869939668.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/8c6e39c7e96752133c0849d3a5f8294a/90409331556.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/zuxilu.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/ggeuoj6f8bq92arrpi655258ia/97251844383.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a860ba9258---risunovasalokunuvu.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/6e87ac9edf5a8fb747a2d7a789409ddb/47921167883.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/tbmku4mep3fe3osdcu21026fb6/rumuxobapudape.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/68ab4ec702e8f20878a6d3a20676e273/91387651605.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160befe4c5ce3c---dunilikojotifol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=samurai+vs+knights+mini+q+answersPDF 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_off0001af30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C747 10956 bytes
SHA-256: 67a97a78d8f059161fdee376f7693d3256be53272d692a0b0e8dd1ea9a208391
font_02_sfnt_off0001e033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E033 17140 bytes
SHA-256: f6539b14f1f09ae64ecf78192e434065b8d14cb7c0909e001a0de7281ab7f57a

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