Malicious PDF — malware analysis report

Static analysis result for SHA-256 628f6df23763cf38…

MALICIOUS

PDF

82.9 KB Created: 2021-09-15 20:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 48dd83d1eaec6c2d803ab2523cebfd06 SHA-1: e4565d29a99a88ea68a35807b675ce4d676208ce SHA-256: 628f6df23763cf3824b4d6726d56ace9a8529c37fb2c4c4a351aef09d3aebca7
196 Risk Score

Malware Insights

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

The PDF document employs a social engineering lure, instructing the user to install a browser extension or update to view content, which is a common tactic for credential theft or malware installation. The presence of numerous external URLs, many pointing to compromised CMS upload storage or disposable hosting, suggests a link farm designed to redirect users to malicious sites. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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=followers+increase+online PDF link annotation
    • https://vokalensemble-vocembalo.ch/userfiles/file/93065327465.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/vazanikojogufogapeva.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/gulakexapupatesus.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/96463808552.pdfIn PDF document text
    • http://stisk.com/file/65081519294.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131f4bf37305---94742031116.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/2057877930.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/pezixukutiline.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161421d60dec5b---5983985005.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b90c0a0e9---66349364847.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/99568587886.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/filipufimuf.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/pepezalilibojaxiwefetu.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/powepitafut.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/14083280089.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/20078316927.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/32541332447.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbfdab5af2---1979300558.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/lekereneponugot.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/23230167579.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/a1ff448d93f2c856302e68b703b117cf/moxojuzekupapeludixa.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/xuwaxasuzi.pdfIn PDF document text
    • http://ifap.it/images/file/30635640638.pdfIn PDF document text
    • https://serka.com/serka/upload/files/86061799334.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/24f689e50ec8d6608bf8bc2721f20e87/96595470065.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_off0000e314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE314 10188 bytes
SHA-256: 4dbfe7444a383f7870c2ceba86734683bde9bfb8f4eab112017e52ebb64514e1
font_01_sfnt_off0000fa12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11224 17152 bytes
SHA-256: 9efe1011bd7737873a908fe63eff1eae01c87548706cba291e39dac3a59b3f73

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