Malicious PDF — malware analysis report

Static analysis result for SHA-256 b48b015006673670…

MALICIOUS

PDF

91.3 KB Created: 2021-09-14 02:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3202877a4adf59968b6db231bb482c01 SHA-1: 590a958f543586b3bfb577a65071075111e1511c SHA-256: b48b0150066736708ddae069c0f71eec5b73c0bc2fad38bd3a40d01339513bea
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to host or redirect to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using compromised sites to distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://yenidenyuzlendirme.com/ckfinder/userfiles/files/82493181428.pdf In PDF document text
    • https://dovolena-jiznicechy.cz/uploads/85912818957.pdfIn PDF document text
    • https://jurad.eu/files/file/dokumofusazatovu.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/55849173347.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/95573740693.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/6b0d5d57bf3d531513cb763925ff6e25/5736105863.pdfIn PDF document text
    • http://robedecreateur.com/img/files/zufivijatabopemipito.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/benijaxuwujokobo.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/7860900268.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/nawipamotogug.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/71512856683.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/8515236911.pdfIn PDF document text
    • https://adci.vn/data/upload/file/77245028752.pdfIn PDF document text
    • https://seerupit.dk/assens/file/lidulatijomitazap.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/wibarilidimo.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/dejujujepu.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136ea6f41393---53119824695.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/tevepigobavub.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338bbf7eb46---39874976617.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd9e9ad012---57747677724.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/c8837ca38a521ef1abf361a92c6222a5/48841770637.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/95564487328.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/ponuvosafojojuwi.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/e8c125ce7869fa1b301bb2a598f08601/18715266375.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/63376087394.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/534c591ca2e4332225a11c87c2731150/44238151912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=android+adaptive+notificationsPDF 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_off000101fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FA 17304 bytes
SHA-256: aeb8c0aa6e48e8af5c7ddf64d34e2a37a85b85ee71be23c0aaad814872f8232d
font_01_sfnt_off00012ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146FB 10616 bytes
SHA-256: 93ea53df5c4a273244a448f956a35bffdfffb74c4fb53d97cac2248f51843f65