Malicious PDF — malware analysis report

Static analysis result for SHA-256 b950cc1196630ef9…

MALICIOUS

PDF

91.8 KB Created: 2021-08-02 18:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e79df551046684b83a09bd6ba94b463e SHA-1: fc3dd2aa8961b39cc07761e2db170744b8f14773 SHA-256: b950cc1196630ef94e3f059f3061bf3352e431d6b3cc1fafd622ba668b71ac54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://turar-mussin.com/userfiles/File/karivokisajoreniwaxowu.pdf In PDF document text
    • https://ecohort.com/userfiles/files/lixemopowoponurezodom.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/38832884753.pdfIn PDF document text
    • https://lasanisports.com/files/87992503151.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/dukukuwarisuw.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f5120503dad---beraj.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/17122866449.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/vesidovixazirejinafene.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/833s0l0u7p3dou5uqcbjoaq7hk/mezukaxulorenelinukukil.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/k2lc83tg0ui3f28b7k227ae2b9/lewekodikawakufefenagage.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/57217459688.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/taftsa2o2pcj9cm4jkptjrcvv2/sekukugimaxododakidubaso.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/toxem.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38ed30bd5c---84472524331.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160778db4e087e---jazapeduv.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/kmsn5iesnsc5bkq89a3rhkijl0/niwisapagagexinuzi.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/qq6orac5o2a3v56qir8mal9r13/sepuwosifodev.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/nimijozubavofasovukixa.pdfIn PDF document text
    • https://lemanssrl.it/file/ludaz.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/66758580252.pdfIn PDF document text
    • https://cecprint.com/images/file/kurinaxisefemu.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/loguze.pdfIn PDF document text
    • http://crabber81reunion.com/clients/b/b6/b60cf3d631ff247311937b5f15bedc89/File/wukukujirukonewojumeb.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/189cf7001316a70a4cdbda5282666c28/29419505564.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/83031852718.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/70789289214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=what+expenses+are+deductible+if+self+employedPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10139 17164 bytes
SHA-256: 5758752d8ccb265b69764ca1a1adadb3efbb3a0b273d2e85b78e050162834038
font_01_sfnt_off00012de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE3 11336 bytes
SHA-256: 18e213cce64f287a180a153c77ba8491329dd668f8c503a8ce8b5e6ea51fa3a1
font_02_sfnt_off0001482b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1482B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1