Malicious PDF — malware analysis report

Static analysis result for SHA-256 b730ccdba83010eb…

MALICIOUS

PDF

81.3 KB Created: 2021-09-10 17:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: db92ec0cf886566557630493b3a5e91c SHA-1: 88bdaf0fae82b515952b9a4cc26113a7b416bf95 SHA-256: b730ccdba83010eba767d1e979c68ab1a8c96bfd58aa89edfecb8abd1173fe9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=simple+video+editor+android PDF link annotation
    • http://bdsps.org/slbdavbatala/userfiles/file/20113628119.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109041318412284.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/litulareduzegofijikoxik.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/82170075791.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/916253590.pdfIn PDF document text
    • https://phunhai.net/upload/files/72033891701.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/8857e64cd229efae6c273e8377f88378/fodowo.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/culaiucvh5669mbv0lpad174e1/fuvuratelipoxuripota.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/8283797784.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/16812792048.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612fba650a187---63698314694.pdfIn PDF document text
    • http://upakuika.com/img/file/nurulogevosavejo.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/29076265520.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/nofikerusivepefisa.pdfIn PDF document text
    • http://gnox.vn/upload/files/belikugu.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/51840030800.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/87637883477.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161365e7ba3a65---49240732809.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/17984513347.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/vofinifujitar.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/risawijosuvi.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/geliluzetikimesof.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/c38314bc1dbcd85b83875e48c866745c/57783649632.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/bitogunokozenakavur.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210909081546.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_off0000dbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBF 10524 bytes
SHA-256: 43e95fc54dc8da1382529e9c130ba58e39707363b473eacedb58c982667704d8
font_01_sfnt_off0000f3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 17032 bytes
SHA-256: 03f20e2e4e31d5539ff8ca447883a6b553d542216f11580e69481f5849a0f52d
font_02_sfnt_off00011f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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