Malicious PDF — malware analysis report

Static analysis result for SHA-256 707a5329eb50375c…

MALICIOUS

PDF

80.4 KB Created: 2021-10-24 23:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 611767a56c4bd4af7918b29c2f204931 SHA-1: 9add1c3a4cdeb6a7ef4e51af31a8b2af20c2e3ec SHA-256: 707a5329eb50375c1ab4e5149d69d2efce3aa0ce116892cb5e2135c57b0f62e7
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised websites or disposable domains, indicating a likely phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary goal appearing to be directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://proleague.dk/userfiles/file/68392625955.pdf In PDF document text
    • http://thegioioto.store/upload/files/3345227828.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/91ejnpgfbl8524akbtecouii2f/22802529201.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85740014485.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/tesiwobekebi.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/84577000416.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/70796873083.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/33198976932.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/zepixeresavojudol.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/maziganuvepaxogojikatu.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/52719083306.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/rowizaperimuguwasagabibo.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/43209120154.pdfIn PDF document text
    • http://tobolsk.fluentrussia.ru/img/content/files/60690069160.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411bd2bbc2e---2351569629.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613729f60499f---42612354391.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/72396371681.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/66800743456.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/buxakezenaxolubeba.pdfIn PDF document text
    • http://lactopad.com/uploads/files/47701352691.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/pomukovolo.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/34725844683.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/68081219689.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/oscUj7J0Gjw/uplcv?utm_term=the+meteor+crater+that+killed+the+dinosaursPDF 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_off0000d4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AE 17900 bytes
SHA-256: 3df79fe06d4cb5c9ff6f085258457911b9e9432c34d34c4e8e425b5c652ad7fe
font_01_sfnt_off00010381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10381 10792 bytes
SHA-256: 43c2abe78f6634486adb4d679998d011d5fd800065912283eec3fee8a6043216
font_02_sfnt_off00011c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1