Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb3443021de366c…

MALICIOUS

PDF

83.9 KB Created: 2021-09-09 23:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1d98a2440dd39dd4525b7efa70c3804b SHA-1: e4af1bf3222f81916f538cd90f0582b880e1f83b SHA-256: 6bb3443021de366c032f89e848430d309e4c624aee4296a979ba3a2cb60f3f99
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=plane+shapes+for+class+2 PDF link annotation
    • http://connectcontrol.net/files/userfiles/files/variduloxe.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/vazaresigazo.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/tuvaz.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/pikexel.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/fomutenuwitemum.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/op86u8k547fdaaakm53036ip7g/9747554220.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/tivekobube.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/13670548300.pdfIn PDF document text
    • http://w-mill.jp/images/file/terufujumejiwaz.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c2e388213---disesoluxax.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/36001594096.pdfIn PDF document text
    • https://people11people.com/uploads/File/vinigir.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/sufuzupa.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/mibatubigexax.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133711bca2f0---7308466788.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27201516280.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132fe87eafe4---2090017364.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/22899941139.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/245b4a858c670e77afd0d6d4c5ec0cbd/divopilu.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/dibiwakajeli.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613718556d8d3---84759109506.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/76354519270.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/35396527519.pdfIn PDF document text
    • http://ministerium.pt/files/wibikikerodugite.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b79c10273---sanulemojipuj.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_off0000e447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE447 10508 bytes
SHA-256: c12f5872f62560d8ee2beaf493b02096361b6be90a88d96ce09be04b5c34d257
font_01_sfnt_off0000fc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001143d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143D 17528 bytes
SHA-256: 93ca76cd276e6b4d2cdb094c01ad87d1df876e0a8d2de7de8b329f7a40196a8d