Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb046eeff65d3f09…

MALICIOUS

PDF

88.6 KB Created: 2021-09-04 10:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bdb9eab420bc864521831c5fdcf98da7 SHA-1: 626e683db35925c1f3f760831f0b8c300bb701c4 SHA-256: bb046eeff65d3f099012fa5250a7dccd96ad527f4c683a49b28987a9f9a3d578
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 distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URL analysis confirm the nature of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://debeight.net/UserFiles/File/95907900763.pdf In PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/9nqdqh8v42tke318g38vl862rf/41377129233.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/puretepedi.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/84977782441.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/lixupegulogoweke.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08faf741e1---tofapiwapinog.pdfIn PDF document text
    • http://holzweiss.at/69641867790.pdfIn PDF document text
    • https://wonkingchina.com/d/files/gatimomixojexufarinisaz.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/tamemarufegivomorevu.pdfIn PDF document text
    • http://allasclub.com/campannas/file/pudixipugu.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/4b4f248cf84c95647b314f5a9b013810/23484721118.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/dugamuwonozu.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/fozunodupafidumojil.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d6dbed9a5---44566825449.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/budinivijuwifuzawe.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/wumowusaxuperusa.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/30510436892.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f0c58816174---pipepazawobet.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/bixenibomepetaj.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098801dc2ce6---60977900856.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/068e2a51d4a791cafd96f089638c5383/60331679835.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/6e9e400ac4446d222c4771c186a1b8fe/junajivitozutupimezi.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737fb8ca3dc---zulawulokusosuzipe.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125ec2be0400---53486689797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=kathua+chargesheet+pdfPDF 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_off0000f578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 10628 bytes
SHA-256: d47ce9d42c9f3f70ff59342bdfe3185bcfc65fc935e9781b1c8e92021d3d9c47
font_01_sfnt_off00010dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC2 18068 bytes
SHA-256: d2cc6d44f131dc220dc25bcbf6be26e82b466dfbc92bfc485a9605084796c8bb
font_02_sfnt_off00013ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1