Malicious PDF — malware analysis report

Static analysis result for SHA-256 e06a5bd1378798d6…

MALICIOUS

PDF

79.6 KB Created: 2021-09-14 07:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 164e58d2a4e8b0e11c4c8c7aea97f4e1 SHA-1: 9656f8a1d3527211a37f2ab451fbd11e134200b2 SHA-256: e06a5bd1378798d638a33ed12e6a9875e14387c1ce14e264d11700d3c7694288
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=camera+save+to+sd+card+android PDF link annotation
    • https://hotel-la-licorne.fr/userfiles/file/33388323172.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/ludigimab.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/46425906764.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/1132843172.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/793323648.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/tusavaralagedagaxowabotok.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/07945eeb77e653ae0d6ca2af63ba393a/xabet.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/najawojeluzimipo.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/lawepifodonoborekosevun.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/3239841624.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/94492231784.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/30223781287.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/59978513902.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/70521210264.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/sopug.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/nokitiw.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/53410701757.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/nisogaxu.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/fizafipon.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/31281006499.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/pagerolazowi.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/g2revi41ura66lcmtis4tefm6q/gadodematafawapimafokara.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133563c49939---56237374362.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://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_off0000d74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74D 17728 bytes
SHA-256: e4130cdc1c42036fadec022cf678ee859d0242dd716ea10b00b8165b32e3e4a8
font_01_sfnt_off00010529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10529 10580 bytes
SHA-256: 263da5f2704161a1cf7b016374d2568fb1b2442fc8dbe86b4c22d8a3f7e4b865
font_02_sfnt_off00011d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1