Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed9a26da818e5f7…

MALICIOUS

PDF

96.9 KB Created: 2021-07-06 16:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e1405eca8037b13979f7da9868afb51c SHA-1: e72c31b33553e5c3763f43f0778e180627b43a0f SHA-256: 3ed9a26da818e5f78834a8b288fd2cc6ced88b63638283d527afc4f6622a2d25
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a malicious link farm designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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 http://uppercanadatwocylinderclub.com/clients/877835/File/mamidikofadave.pdf In PDF document text
    • http://techbis.pl/files/file/zenige.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd30269f09---92613350715.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/9292186637.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/gerugiketi.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/lukisitetipejawu.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/33597638370.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/39mkj7m9bda47cqkdkdrst2vq0/zumatikolezotuwoka.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/btm879g99l6ltdpl2ih8p3c60i/tebigufemo.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/30403926432.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/38755089077.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/rovazulitigejuzipo.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9c20f3ad0---lenazusexifalowavelatotez.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160783152761fd---tajufefaminomejaju.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/bobesezikiji.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/berelegusefamizozupolibi.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a4139c558f9---livuxu.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/srnlrufvicn5ku7mucngpisamd/vosufimixoxelosas.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081483fd473f---rupojevegix.pdfIn PDF document text
    • http://fabtur.ru/upload/files/sejugepodubovemuxezu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/m2m5d8god310g6rvr2i31g8tk0/koribuza.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f73f7963fdf8bb0c05e070804828ccf2/38181108764.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/v8tq1r4rmk4so872d1a58aokg7/gewamurisososiga.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/20195379514.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608106eeee0b2---54605277257.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608201caeef84---fipod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+find+the+period+of+a+sinusoidal+functionPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B4 18092 bytes
SHA-256: bf967b009875788a73ed82398d8128a2e13340ddf1b638209d670865af85dc90
font_02_sfnt_off000146ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146AB 10892 bytes
SHA-256: e36e16e9eb7617169306cb7f27f1889c5918545a27f775e4badf9f020722410a
font_03_sfnt_off00015fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FCA 16164 bytes
SHA-256: 9ca54e25ad7b8843ef54322064e8fa997d8c8dd2be946179bc48b7a4937553b4