Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb0ff8fabeae4993…

MALICIOUS

PDF

70.7 KB Created: 2021-09-27 00:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d9f57488843e76275d8a75e98193b807 SHA-1: 0e98c3589a3b99473ed7a029b5da7137e9cbf299 SHA-256: bb0ff8fabeae4993756ebca26e792841ee3ab1dfc5677b6ee4b91ce3ff8aede2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of link farms or hosted on compromised sites, suggesting a phishing or malware distribution campaign. The presence of external URI heuristics further supports the redirection to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://synerhu.ru/uplcv?utm_term=ntsa+learner+driver+handbook PDF link annotation
    • http://aptekadc.pl/userfiles/userfile/35545999045.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/ligunapub.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/74194334302.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/67546383522.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/18661703172.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/lk5n15h15ld4cd28443b68i8of/terewipalunafekafuzaj.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149c873680d4---37459198782.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210925212603.pdfIn PDF document text
    • http://signfabapp.com/ckfinder/userfiles/files/61642700358.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/93673859641.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/gakofuji.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/rinekegemif.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/75716026644.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/39971882073.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/80609178168.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/85625915860.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/50875695943.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210915/file/rorev.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/b382f77cc187fbfc64c745aa62080f32/97214717276.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/16763283483.pdfIn PDF document text
    • https://rm-parketi.si/uploads/munugirutesazusaxilubumiz.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/pevogutikava.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/sapizunuxa.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353c695648e.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/12703125076.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_off0000b12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12C 17176 bytes
SHA-256: 221034384d95eab7dee15135754295c258f3842394e20aa2c6fa1ab4720f6134
font_01_sfnt_off0000dcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEA 10620 bytes
SHA-256: 9e1a04dc86068a4d516e8839a094e9391882c10eb91d1e9c706f5dd8901ba402
font_02_sfnt_off0000f51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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