Malicious PDF — malware analysis report

Static analysis result for SHA-256 0151cde4d2bcc22e…

MALICIOUS

PDF

86.1 KB Created: 2021-09-18 06:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9af19426ed9bab7010d501cab8f36383 SHA-1: 73c2de14d9e579fda75e4ee2a8af8e74775ef79d SHA-256: 0151cde4d2bcc22ea2f7650940e3285d7add9ad6378360473349203eddb10bd6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting suggests the document is designed to lure users to external sites, likely for phishing or malware distribution. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://homeopathyhk.com/files/59159728689.pdf In PDF document text
    • http://upakuika.com/img/file/susuvivopum.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaf1928a6c---kodebevimowojaso.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6p7u6s598h2j3psf6i8au6rs57/guredijagugaret.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/sosuxelimegazodinopux.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/46530501186.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/f5efc4a3ae1494f851fce410b5bc1739/65948732502.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/28162460617.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/nazopudejof.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/bizolovur.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/dogisasunasupozesiradino.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/89407164461.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/wumajuxu.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/22718947740.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/gubaf.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/46618320276.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/jatagonibevuzugoremavuz.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/37410679872.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/gofowanufimu.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/lubuxukubozafegose.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/mavudovunekefitazilawabax.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/moxemusa.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/85028797725.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/tisosavakibududeraponoto.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/69220522773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=android+sms+app+redditPDF 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_off0000ebe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE0 10488 bytes
SHA-256: 60828023c5b0818bb55045db5c09dd3a5e9677fb935f18934ce5c7458c8f6b15
font_01_sfnt_off000103b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B2 18056 bytes
SHA-256: 09abce920500251130f398ea45765f9778fde9838edb5166bb58f6c44e9570c0
font_02_sfnt_off0001329d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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