Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e3723cbe241ede…

MALICIOUS

PDF

86.1 KB Created: 2021-09-16 22:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: acd63cab9c4361b2b7dcecef506740ce SHA-1: 1fd3ef4e2188ec4bda479439e69e22061145f7d7 SHA-256: 61e3723cbe241edea80a7d1954f68cbde53198af668e5e6887ddcc2263d71df3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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=sweet+revenge+season+1+episode+1 PDF link annotation
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/4088833188.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/67650980049.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/22182112852.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613e14bbd68df---42446138032.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/suxebuzujulubinevij.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/xagoraxora.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d78de8e522---35914956436.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161403ef928a94---42663872153.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/94504882143.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/gosipajazarisimafuzadaw.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/kuminemesi.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/susododisebekevepe.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/lelewavorumapikugom.pdfIn PDF document text
    • http://change4best.ru/upload/file/gafelul.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guwumafawasutolako.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/31990752055.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/19325226944.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/62691829176.pdfIn PDF document text
    • http://only-svet.ru/upload/files/90037805235.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/xuvoxivugofimozalat.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/808489606.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/30434478591.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_off0000ea5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5D 10800 bytes
SHA-256: 0cf124bcb39b696d98491150a8e1abd93f43c6f4f0aaf3137cc3534e4c64869d
font_01_sfnt_off00010342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10342 18220 bytes
SHA-256: b692413e378ec5cb327f99bcafe6bd6538863160a5fca28bbfbc078fa72d52e4
font_02_sfnt_off00013273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13273 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1