Malicious PDF — malware analysis report

Static analysis result for SHA-256 9346c9e72b1421ea…

MALICIOUS

PDF

81.4 KB Created: 2021-09-12 05:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bc67569b3d6a293f60fadad6e6982afc SHA-1: c4d1bc81a2e830836e5af4a0f9228d3779bb11ac SHA-256: 9346c9e72b1421ea95b72e239d829399e0bac06b02415dc2a8d49b3619106aae
172 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and a link farm pointing to various domains, some of which are hosted on compromised CMS uploads. The ML classifier also strongly indicated maliciousness. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely for downloading additional payloads or redirecting the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • 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.
  • 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 http://vit-physio.de/file/14858526196.pdf In PDF document text
    • https://diarch.in/WYSIWYGImage/file/nuraboxariguwokunajaku.pdfIn PDF document text
    • http://handgun.ee/media/file/nelopuxukobitasebekozet.pdfIn PDF document text
    • http://one9five.com/userfiles/files/29310873923.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134091fe9b46---5891827764.pdfIn PDF document text
    • http://belloverde.net/emailer/file/66133704840.pdfIn PDF document text
    • http://nanopena.cz/upload/file/pulerufowewovat.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/87214661864.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/88346947718.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/luzuk.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ahqc6je5ec0edhnqf5tf6thrvh/jasodad.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/36462814413.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/41551452657.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613130a85a7ea---50211266903.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/kirasiwubukulalefejadumuf.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/95435599348.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/jetuzapikup.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/98357753391.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/wikexerewosi.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/zijid.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/62875977847.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/73469175228.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/40756073357.pdfIn PDF document text
    • http://wjcopy.com/upload/files/tenowozeriw.pdfIn PDF document text
    • http://mutitar.com/user_img/files/mudivegowatubeketijusut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=xray+mod+for+minecraft+bedrock+editionPDF 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_off0000d72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72A 10776 bytes
SHA-256: 4f530e3afe7108a2ec3193fdfa11b911882423ec11f16386db0136324d15d7aa
font_01_sfnt_off0000eff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF3 18416 bytes
SHA-256: 9ac7151fc904043ddf1cd0f7119558ebedd13eda900b828f314f5c548d6885b5
font_02_sfnt_off00011ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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