Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a7ef095b1e3e7d…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 13:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1d9c2efc41afe11a2d8c640c7537c8e6 SHA-1: 4cb80bd4b5db2e6eb6dc4fe4af2cc579947531ad SHA-256: d0a7ef095b1e3e7d0378a368fd15ae4a34166960625b98ef90316ffca444657f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ML classifiers and ClamAV. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://iccj.jp/images/uploads/fckeditor/file/lutoli.pdf In PDF document text
    • http://xaydungphongphu.com/uploads/files/zemojatidoli.pdfIn PDF document text
    • https://proia.bg/userfiles/file/vojitinazoduzuz.pdfIn PDF document text
    • http://synergyproperty.com/images/files/30309615338.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/vuxoz.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/74575315061.pdfIn PDF document text
    • http://gyobel.itpublic/file/15568597533.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f77a8e56d12---nezafubusobokukupuwe.pdfIn PDF document text
    • http://epmachine.ru/d/files/88104999955.pdfIn PDF document text
    • http://rockfordauburn1966.com/clients/8/85/8549db0cc7d1f63cce07d3be93bd6f3d/File/sewol.pdfIn PDF document text
    • http://toroisg.com/public/images/files/69230587724.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/2405162204.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088671ada726---43626265363.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/12150200306.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/kutanakizepunabegirukoluf.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/e970a489fe8195cd38e2fad2cec55186/lofifaripaxarezezuxafag.pdfIn PDF document text
    • http://lulanjina.net/upload/files/tufidadu.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/suvexilumakokolatilus.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/gexadafudumujidifusixibut.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/tudoj.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/49054928954.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078cffdaeeb2---solalep.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/woluxekirujusoj.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/logira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=genetics+worksheet+%239+blood+types+answersPDF link annotation
    • https://medlineplus.gov/genetics/In 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_off0000d656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD656 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 17136 bytes
SHA-256: 413475e9170646ea5c99ea9fd1d6d0b8199e5063b5b37a4850621e85d9adf926
font_02_sfnt_off00011aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA6 10336 bytes
SHA-256: 4b08a8e55518b2b6fbeb56015c3514076af4797d2ce9129b85525449f47c7ccf

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