Malicious PDF — malware analysis report

Static analysis result for SHA-256 01ec9437f5eaf181…

MALICIOUS

PDF

78.9 KB Created: 2021-09-12 23:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9403dceb1881eccc0dcb038360648410 SHA-1: 1f4c4aa6bd4139296be5ad8cb1f558a2ac3e60b6 SHA-256: 01ec9437f5eaf181a282ebd15f3a4e6e8a79a4cd16e17413103a391b6838af7f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing an embedded JavaScript stream, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage and other external URLs, suggesting an attempt to redirect users to malicious or phishing content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hvo6jl4knjfopekm9f04fj4f05/rixopod.pdf In PDF document text
    • http://freeorden.com/media/file/83973080169.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/jawesegolepuwelagoviga.pdfIn PDF document text
    • https://cartolmania.it/file/dakowewusufelekuv.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/zixim.pdfIn PDF document text
    • http://muszempilla.com/files/file/tiwupibetebun.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/kijinurezadewaserisud.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/perumesidanazanezo.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/mukipozonulosejevan.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/10698972649.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/venofomusoj.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/ziwagoduza.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/50812878427.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/39110814117.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/63921204136.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/vutebif.pdfIn PDF document text
    • http://www.moyekolodin.com/files/92636647952.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/56657119220.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/76940196132.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/1011364820.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/89053561614.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-10/20210910085606666453.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/wepipoge.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133db5da065d---dobesunisa.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/luzif.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139bf82e185b---zubakabutisar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=road+warrior+apkPDF 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_off0000ce42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE42 10060 bytes
SHA-256: 73acef582ec278995db5c4de6fabf7db7ba869c835c84bbbacb7d3dd720982ab
font_01_sfnt_off0000e4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BE 18952 bytes
SHA-256: 52a63fb20ca2cd73396f927c8f534b045c8b500c72be0345256179cf651cee47
font_02_sfnt_off0001162c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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