Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b14b574faa8a6f1…

MALICIOUS

PDF

81.9 KB Created: 2021-08-24 17:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 09f22ba39745f0745112af795dae2d0e SHA-1: 3d22951ca5fdd56939816651a6294159ad05af9f SHA-256: 3b14b574faa8a6f1117f95e174a1a8d8ab1ebcb6d5e3119246ae70c271cfa1e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=harry+potter+myers+briggs PDF link annotation
    • https://najlepsze-w-polsce.pl/uploads/26603212229.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/fumuzexixezidaxemovoj.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/wafajeboretiv.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/nezimufifij.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/41672789321.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161041f03ae4ed---74046017968.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1606c904c51ed0---61274678664.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ac58f3f68c4dae3b67948b821cc6b921/14295642822.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/xelojadoxaxofu.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/80e330973de660616e55e28aaabb42f6/80194360827.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/41915750590.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/pusojixudazexinopezesuv.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607276a84fb3b---85581329000.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/54386411498.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/5281851816.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775823c6b02---50938188238.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/70754458400.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/38613712663.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/25704107942.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160714ed722992---54549867090.pdfIn PDF document text
    • http://landpas.pl/upload/file/69784155801.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea5e5d23a0---96068804740.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/55284839777.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_off0000dab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 10688 bytes
SHA-256: 02ac9c60b348b5e7e8e538b5340cd27ce175ecec532266253f3dd1881f191b9d
font_02_sfnt_off00010b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B25 17132 bytes
SHA-256: ead3b13d8324e9f80f093d5f0702aa5cd5412ab158fd87eb3516931aaaff6189

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