Malicious PDF — malware analysis report

Static analysis result for SHA-256 a146cee1e8d56936…

MALICIOUS

PDF

72.9 KB Created: 2021-09-03 15:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4cd88f966e0e90a788ec64820d41165d SHA-1: 557b20ec355abe07cfc40d70bf7069f58dece4c7 SHA-256: a146cee1e8d56936122352238eb6360b1d4632bb87d08b801f6787644948a004
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=email+writing+worksheets+for+grade+7
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9colo33h5n312t1i9urvlehbv4/goxurufagovafepajafav.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/b93314cab30abb41bee45cf814bfb2a2/60503735556.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808d3d36e79---jabitoxodavelaxe.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075c87e283ec---kaxozavajomabumedakaxot.pdf
    • http://garmagostaran.com/Upload/file/31987218685.pdf
    • https://brod-plovdiv.com/images/ropibotiga.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/46164004758.pdf
    • http://phantasos.org/userfiles/file/vovajigagokasumez.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160738a346cef7---88740897868.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/4c8595ab503b8d0908b7e15ba1ab48c9/tuwebaz.pdf
    • http://sprinter-lab.ru/content/File/reradevilifizasupigatavil.pdf
    • http://universalthailand.com/images/uploads/ckfinder/files/94417009598.pdf
    • https://www.corpeverest.com/ckfinder/userfiles/files/xoserumitiruxezilawanojax.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607787da20f59---23132532459.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f4ef55b6c---kabuwoxifebazunutemapabav.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c218d136f4d---peleginimirafikumo.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16074ca59ef1b2---kodederukokuzuxagazevun.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a579d574722---monekepifi.pdf
    • http://sevoir.hu/uploads/file/mejuwixisurofexeba.pdf
    • http://blevy.com/ckfinder/userfiles/files/gutunurukukolekamebedu.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a013a0120b1---wogonuse.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/d85f266656a8ff881901afdb2aaef904/liwuxazemaxupatutoxivuwom.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/zoxexafasetat.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000badd.bin
64af2715f31704060b6def0f792cf28f923204486c91d35df0126ef1869e838e
pdf-font-stream PDF embedded font (sfnt) at offset 0xBADD 11012 bytes
font_01_sfnt_off0000d420.bin
d4a16f93d19e5f5e4319ed809ab905d59ba474107720c8c4efe0cae1d9319b32
pdf-font-stream PDF embedded font (sfnt) at offset 0xD420 16556 bytes
font_02_sfnt_off0000fe6a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6A 16792 bytes