Malicious PDF — malware analysis report

Static analysis result for SHA-256 bded7e1109061803…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 01:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3919696bbc87a71ce881d1cf51e86352 SHA-1: 290798bd4bf1e086bbcfab0fb18c50c098072a6c SHA-256: bded7e11090618032f5aa08e06f2796eb32715c8c1aed6b2b42b13e8561b8672
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://savvyais.com/userfiles/file/kabagozidabukuropojon.pdf In PDF document text
    • https://urbanlivin.lu/userfiles/files/50915521233.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/diraloz.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1540894053.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/letibuxikutedapi.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/63843470322.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/4959970268.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/e63e660a84cedb8da83f01068d2df43a/66999173038.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/pagepiruwifiruseduwut.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/relidupelinagut.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/72236096209.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/il4teff0qvt3jluhfqs93spedv/nukanipeluvuvajarara.pdfIn PDF document text
    • http://soles2walk.cz/data/file/69607087817.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/62793599580.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/xiredevitixujeribuk.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/fumedidosiganalin.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1e3862137---rofajabizir.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e67b3268e---40894626199.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8793d28a3---6163161875.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/63435662665.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b81f41504---bukepunobifigarefato.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/jibobogezujazolesikibajuv.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/75809201042.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/zizobu.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1698cb4be---tazikubevodesapixanujokek.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877b344eec3---zekevaduzidubalidopezewab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=home+barista+best+manual+grinderPDF 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_off0000df07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71E 10820 bytes
SHA-256: cab5104480f50a5cf36acf23c8a021d459c7dda9fd0b0cf9a73e18a21682dd42
font_02_sfnt_off00010fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC0 17748 bytes
SHA-256: 3c08c27f80ced1d0b559d242263043a95c1db54de7214d8a0ec147ce5625f666