Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a488d8c1a06a893…

MALICIOUS

PDF

74.2 KB Created: 2021-08-28 01:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9cd144c6808ac6e208e931e37d046889 SHA-1: d73ce09ffbdab67e4da9ac254f12873d850caaa9 SHA-256: 2a488d8c1a06a893206a139515cfd38e59d2d7be57165193bd013e3a9131f5b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, specifically targeting the 'formcraft' plugin's file upload functionality. These links likely serve as a distribution point for further malicious content, such as phishing pages or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, and the presence of embedded URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608784509104c---18713531561.pdf In PDF document text
    • https://kis-u.com/page_data/file/20210625005432.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7a7bc2c85---85743473779.pdfIn PDF document text
    • http://roocenter.ru/upload/file/33233414054.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/91061833425.pdfIn PDF document text
    • http://maihome.hu/admin1/file/gisawalufibinuv.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/26006574087.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/dirimad.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/54626318891.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/kuxurorukowaliwekodagupe.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d290d62096---17406850902.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829f9d00d49---60588872346.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/25588604648.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/14809563417.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/zewogimoge.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1720dba1f0---83053521469.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/jk8fkkts3db1gcp04dvmqh0ikm/deboxasom.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/gomezewa.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a92e6ea0b---menekalut.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/b4c9a114f96f63bec027bf2881a2129e/kubuwedelipurezaxaretorap.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160860ca79c8e8---fenijuxezenu.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/bivupidigoxiwepanovekizir.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/vevarojabe.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/kakifaxinaweje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=coldest+planet+in+solar+systemPDF 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_off0000bf1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1A 10700 bytes
SHA-256: c4b448c75e31bc28ee968fcb86222f91e6851dd9849b517aa5ddd3adf5702d04
font_01_sfnt_off0000d7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 16628 bytes
SHA-256: 48c2f29e4a39aba8da8c96f577cbfedf29fd6f87b8de1eac06de2b3c49c1b7a2