Malicious PDF — malware analysis report

Static analysis result for SHA-256 be746cb4a2632969…

MALICIOUS

PDF

88.4 KB Created: 2021-09-07 15:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c107a8e53010895d16aa2d65183f877 SHA-1: bdbac33d8c586ff3a578aa9f2da2109cea7024ab SHA-256: be746cb4a2632969effd5a5bff31b8d2ecb00c701b2d1302e9ef4d2551c465ae
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF-specific heuristics further supports its classification as a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crewmak.ru/uplcv?utm_term=dungeons+and+dragons+5e+basic+rules+pdf PDF link annotation
    • http://accessprecision.com/userfiles/file/kajuxozerumadaxozalap.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/sexazaput.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0e59a97721588825e6adbd3028264e3b/tuvejumisatezusenowaj.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/55406323705.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/43520235698.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/21379325776.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/84876636208.pdfIn PDF document text
    • http://mesterek.net/tmp/sumomam.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/51582645108.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610610379f5ef---79048838258.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/rujawa.pdfIn PDF document text
    • http://klhl.com/userfiles/file/kemewudi.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210815032211.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/n3b4icthr0mp13tg5t0hen3bis/vopaluzilosovexodazoj.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/c2st25degiip1dmudi2qredsd1/71107869118.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/mimozog.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd94ce64389---rojibewonis.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/e062da1fc9f356c07c04bde697543592/tiroziju.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/75752539959.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce585b030c0ca0d42a4eec917bd84d4a/ruzif.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609072238e350---dafomavaxelerut.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/19709443773.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e7eb51bc5---pevamamogevukubuxarowo.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b952df43287---lidoxisad.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210729162758174748.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076861f1ea2b---54162001682.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_off0000f26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 11072 bytes
SHA-256: 5333364501e73399b6484236c4a97fc52d2b26023cb567922d3fd460d69b5d59
font_01_sfnt_off00010bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12403 18388 bytes
SHA-256: 7df714e01f330c09284f1e297953484af4e4f33d43bab30248eb2a851940a030

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