Malicious PDF — malware analysis report

Static analysis result for SHA-256 3446ea2cc478a251…

MALICIOUS

PDF

74.1 KB Created: 2021-09-16 14:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f8d1e1bd4388f8796bfe6541cac1968 SHA-1: a80e46d3bcbdc56c43e14b24c1d1996416016ca9 SHA-256: 3446ea2cc478a2515be8ed6d537e8e2ccd33b8c6706645a0de7f67a98f58a4ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised or disposable domains, suggesting a link farm designed to redirect users to potentially unwanted software or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=nordvpn+pro+mod+apk+download PDF link annotation
    • http://konferencii.org/web/uploads/assets/file/4048403907.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/93229621294.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/wabazimeredorolo.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161399bbd4afe9---wofud.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/lorafedetu.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/63505088892.pdfIn PDF document text
    • https://notarbrazda.cz/userfiles/file/In PDF document text
    • https://cukimentescukraszda.hu/files/files/topujajevewitakotepuvena.pdfIn PDF document text
    • http://hinodanang.com/uploads/image/files/56836520267.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/52225933762.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bebe7cdbb---65189583380.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/727eaff16d19901e6f53e60343de10d2/konufuv.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/52069091265.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/duwupefijemanu.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/19629462131.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/7304407231.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/37615208119.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/dozowo.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/9246337303.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/be9b9dcaf42025754572c099b49f98d2/23673232962.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/22847756354.pdfIn PDF document text
    • https://satesayap.com/contents/files/48088304032.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210916105414.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/92735734791.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_off0000be30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE30 17328 bytes
SHA-256: 4e9cdc0619438eb2e6b77e387513494d7156895d402ad2655a77597f44d36560
font_01_sfnt_off0000eb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 10284 bytes
SHA-256: 79e26bf087fec12cfa83ea596a0ed67e109744fef422965857b271cf02bc1e23
font_02_sfnt_off00010266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10266 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1