Malicious PDF — malware analysis report

Static analysis result for SHA-256 171dd3465a1b641e…

MALICIOUS

PDF

82.9 KB Created: 2021-09-14 17:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: abde6b3850c4126973382f6a1455b13b SHA-1: 6730de2318e8995556b2fdf4c73f9cf8f52f6e8b SHA-256: 171dd3465a1b641ebbcc6bfa9baaecdc2f5a8f3cd2c72978c6511a79ec9b4d84
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristics indicate the PDF acts as a link farm, directing users to various external URLs, some hosted on compromised CMS upload storage. These URLs likely serve as lures for phishing or to download further malicious payloads, aligning with the ML classifier and ClamAV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://smidgel.ru/uplcv?utm_term=modded+games+for+ios PDF link annotation
    • http://thevalleytrader.com/files/33702238308.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/91876157316.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/18064009323.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/22390187789.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/64059528473.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/namizedazixiforu.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/2193850799.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/samatemopufimi.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/jolazamilatesesixubob.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/muzis.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/79752088539.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/7714250250.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/41511835098.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613138d9160a7---jopiwefiweripupaxutiv.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/50569577487.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/90434327286.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/55063860295.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161387e1255d93---97141223760.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/cmmmqj372as4hc13m6f5b54j2e/96995129618.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/nesigowiguxo.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/jefoxoni.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/19402655295.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/23274333265.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613c721a04a7b---35305734174.pdfIn 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_off0000e0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 17624 bytes
SHA-256: 1b15c1e658110f545137f37b24dcbccfaaaf7b14585d7aecbb79b6fa59ee8c5d
font_02_sfnt_off000126c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C7 10440 bytes
SHA-256: 821af1c2da1eab6e5d0d07b79dcc8875d53394a6b439b39efa27b969aa58b4cb

Open this report in the interactive analyzer, or submit your own file for analysis.