Malicious PDF — malware analysis report

Static analysis result for SHA-256 88743f4f0714ac1f…

MALICIOUS

PDF

88.4 KB Created: 2021-07-27 04:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07bb3ffc2b0171e849608b5fe07144c0 SHA-1: b8a2a06301898d017f278ac343864893ce552600 SHA-256: 88743f4f0714ac1fdc1e979a69ba2035aa2f5aac59ff5c40e913fd314dbbcd9a
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and multiple links pointing to compromised websites, indicating an attempt to host and distribute malicious content. The presence of a visual download button further supports a social engineering lure. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/0166b30be87a961e8ae6b828269e4d56/kubixaruvoremesuxapip.pdf In PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a2e06c645e978ea589e11ab2804cef6/24914932480.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/rufeduraw.pdfIn PDF document text
    • https://eurotig.ro/file/godazevawade.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/podazikerolutili.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/53800117397.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ad114b3d7---28024378187.pdfIn PDF document text
    • http://atek-ent.com/upload/file/rugapexav.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/xuxabederetimefivitagez.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210620_5895A6B347E697D4.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/68203291229.pdfIn PDF document text
    • http://candientuvibra.com/images/file/46444421649.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56a5824523---gaxojiwerevikonekoxogewir.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/795opqcajv8ca1j2rdeu4qlnk2/82980224636.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa438ab328---wufidofilakuvirot.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/loponeb.pdfIn PDF document text
    • http://christopherdallo.com/file/sosajinubodebujamumow.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/pukezinolerafum.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/n87pptl98rj2lj2velk3hl0i2u/wanuwujanexizine.pdfIn PDF document text
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/29285735096.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/tefugajasenezorivusosate.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/443f87af6b164a709e58b4cf62f84497/47490151731.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/85260396068.pdfIn PDF document text
    • http://hangquangauto.com/files/buwagaludajakagi.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9152f699ee93071303af4d5a3cdc0b64/93929031358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=incredimail+2.5+compatible+windows+10PDF 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_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 11344 bytes
SHA-256: 9b24d3a354781e0d3a7ef35186e04f64698efe59b8368d9dfde0baa5e6a3f23a
font_01_sfnt_off00010d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D90 17468 bytes
SHA-256: c612b92b15f91f01f56688a9d8553673170ccd0731b5a630ca842a6eab72a4fa
font_02_sfnt_off00013ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1