Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41ff64f6cdd3e13…

MALICIOUS

PDF

86.2 KB Created: 2021-07-13 21:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3364993c9a9dea803d2a7e794212b766 SHA-1: 2aa793a1b93eb8447f109cfa9d4f0e61ebcd8381 SHA-256: f41ff64f6cdd3e1361c690884691dc373c65fa015537117b59578e4f618b0393
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the file is intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://oniceh.ru/uplcv?utm_term=architectural+symbol+for+electrical+outlet PDF link annotation
    • http://dcbestwings.com/uploads/files/53645715306.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/dc5a48b31b1b384e43304ca9b15b4b00/zusugemuma.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/nudodutufu.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089268ab98b3---wosunulijuv.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b520bf963a0---juzasijorogitovor.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/9ea06459ac43bd5bd454d56f6d7cc69d/nuluven.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/6c2fdd4d23c568307685e3e1f98852d8/28154558619.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea4a6bb331---jadiwixumabofofudi.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e73723209---90355555904.pdfIn PDF document text
    • https://songhong.info/userfiles/file/10016342513.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79fc59f7ec---34926381341.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/mozozebunijaxozusowixu.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/supifilipoto.pdfIn PDF document text
    • http://www.siposferenc.hu/html/zanukufobizare.pdfIn PDF document text
    • https://tckontrola.hr/files/84820382521.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/59864219230.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/3898883544.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15e72b6d34---jenuzajidarodilabifo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/5f53e60c1b14deffdeb03f160e8f1f62/jokadugikenonivefaje.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/cc0b9496f12eee9993cebfbe35e93224/72045232136.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/11637770922.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/83745181690.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b141c4f8ee---kidenedeketoponob.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE17 10832 bytes
SHA-256: 4f1c2d98eff9c41dbd21b70aa62cc26f80b7740885a6ee8d74f33e11dc02ae7a
font_01_sfnt_off00010729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3B 16920 bytes
SHA-256: 487e3a1d5b11e48c57e2919e19ad0d621a647f1aaeb217309c56ed9a99502334

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