Malicious PDF — malware analysis report

Static analysis result for SHA-256 a861715c7c55658d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 10:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14dc9640adfd17dd510a9da39229ee34 SHA-1: a46ec49e5311a3b66f00b0927ef596da52b6e764 SHA-256: a861715c7c55658dd3a7b06091f04feb10fa0bb019b8ac0babd29c999f85d977
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://hophamthaibinh.com/upload/files/67515944061.pdf In PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/502c6da2c8521ffb25c3a558510f0fc1/70348649276.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/morevukuma.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/7487938041.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/bomalemuwofiwilajupadid.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/72279969152.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/57325663618.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/jezok.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/907993868.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141199c2db51---nupopogipefit.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/33077318638.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/24210138301.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132a65c0b265---jesejebetob.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/lizivaxasatamalib.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/laruwadozokizutumu.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16141a601902a1---jurusevunulawenulopi.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/dabukemilulebin.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/7967616577.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/tiwexunojuzimoremazami.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090704342473499.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/zidunufagenaxidufarane.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/27883494747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+get+emails+on+my+phonePDF 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_off0000dc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41F 10788 bytes
SHA-256: 30310abae9c6710f2979eda85f72b0a646848d60ac68e9963b16bc0e7da01d72
font_02_sfnt_off00010cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD0 18168 bytes
SHA-256: f1bf66e4cc932aa2c025d758711afc60c4781c7efe301ed1b1cb605d6b8cdf75

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