Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0bb192b4b434bd…

MALICIOUS

PDF

87.4 KB Created: 2021-09-22 12:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9d79482249c783f7c9f3ce05fa7f1c5f SHA-1: 0359d99c87a7d9be37dd16a4dc818d9f76137d63 SHA-256: ae0bb192b4b434bda467be2bbf938ce8f96671fedcf14cbcfdf3fc2664b73632
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains embedded JavaScript and numerous external links, many pointing to other PDF files hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to distribute malware. The presence of a visual download button further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://nomylo.ru/uplcv?utm_term=apk+android+pro+gratis PDF link annotation
    • http://makinsushi.com/uploads/files/rabavakiloxosovanol.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/fubafuvasu.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/20033562341.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/wabavijarinusuf.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/28335669389.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135092dcbd12---xaposudaluxexixowinabusa.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/womurelovubifumedorovon.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/vovava.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613610995792d---17307148032.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/tosadawoga.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/26222727741.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/fepikudonokesavidem.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/31954551979.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/31628305893.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe6d5d1ef5---82205138762.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/62637874814.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/b6b936083686fb3f0c04c31f0b7dd3f2/buxoke.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/rakaxosegomaxuzebidujo.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/xasaravomojow.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/442511058681630462301.pdfIn PDF document text
    • http://hmed.vn/upload/files/15145531265.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/jibaforigasigowaseve.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149048e38812---pifiwusul.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/zafuka.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/dixof.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/42540583568.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_off0000f01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 18616 bytes
SHA-256: 0c97ab621bf15a566612ae9e3b507051d52ceb4f8020d957c0d0a2cc38ec140b
font_01_sfnt_off000120a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B9 10464 bytes
SHA-256: 03427436caffc35718404a8b9074e90983ad2ad9381fe503647a130000b3e55a

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