Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61cc735bb5466b8…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 04:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dfc767395ca65787ed1204c3e09b79ab SHA-1: b7d8dcb8d3d67eae8db43bbb05c9c7e779db8172 SHA-256: c61cc735bb5466b8315a92db2eb89a32f10f649df9741fdfe7cb8abbed789b5c
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 redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=actuarial+tables+uk+pdf PDF link annotation
    • http://ukkies.be/userfiles/file/31122015136.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/44a1kjva2g2sp2iecda7poce67/muriva.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/27127727498.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/44492061886.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/70534156802.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/95729345043.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/20773544440.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160aaac39b1ca8---wiresubutatotibulepunuwe.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/46314070250.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1602cc508---27600323818.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/0c8smctt4302qt4fstp2i8qbtt/88816837995.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/056m42b3igoie4143b5u6mgnnh/piwotolumegixuwasidaw.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070277877e87---begudekesezirufideki.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d405ac2642---mumezewif.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22fc649a92---zujojibiwidogekaxebilabel.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/4153962267.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/tofuwosixekonim.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f21623dd9fd---99576341159.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/4kvqddkr0j4eerhqj73g5tak8f/10448996508.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dc23c2b18---33129196983.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607264092e82e---fuvobukunaxexesavi.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/88518228762.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3464296e0a---wubomosibaxozejujel.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/towap.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/56136391319.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_off0000de80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE80 18164 bytes
SHA-256: 492c9020125ef4bd9796e703981951e2c76e627645b7e5132300f2723d93083e
font_01_sfnt_off00010d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1B 10700 bytes
SHA-256: 0f59fb96ecde0ac5586430cb829f154a89b2fe3bd6691f2647cc5f3d7b967d4d
font_02_sfnt_off00012598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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