Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5558a96b8b91c06…

MALICIOUS

PDF

71.6 KB Created: 2021-09-27 05:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 49adfce4559ff310b230e0afcab17c2c SHA-1: ed3b8f867e4657736bcd1e3b7ca42aef997c6163 SHA-256: d5558a96b8b91c06fa902932c73caf69eb6c71d7f256a97fd4f2efcd4ebdc870
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, 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 redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=android+alphabetical+scroll PDF link annotation
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/zubisu.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/82789060244.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/60573846646.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/rotabiwiwoparebilakinofat.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/18901001589.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/ritixobobanukeja.pdfIn PDF document text
    • https://reniuved.it/file/nadidaginapuduwopebu.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/jepunoraxojupezuj.pdfIn PDF document text
    • http://rentaruedas.com/files/others/gazomolikiluf.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/42676431893.pdfIn PDF document text
    • http://net-work.cz/data/file/xiwatafidowutokidideras.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f62f20ed08fbea2c28df680bd552523d/35384317261.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/2f7p4o7rfkp61fn2fgqf4jl482/vorapusojaki.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/16002902108.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/82322549748.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/jakese.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/rabijozogexatapufap.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/senawino.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/25089177645.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a6d5341666ba9efe6e9e632f8f583b76/zovisudedajiboroz.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/1793780990.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/95565906130.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/98762394498.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613fff4c6c0b5---xuzumimulativokixewowigap.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/3d1h1i8lo7oj4n4ps2cdp663g2/71068040275.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_off0000b385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB385 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB97 17140 bytes
SHA-256: 415b43df5f1446ad1b94a87c33be9310e60688cd4928831e16c551944dc248e4
font_02_sfnt_off0000f8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C1 10732 bytes
SHA-256: dad31e4f6b9067eacd45145c1f7a152c193013daecbcd4212da299af3346e1e5

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