Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1ca8763e6b7a7a…

MALICIOUS

PDF

80.3 KB Created: 2021-09-13 20:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d8eeef8b58dff71be1002f5b13136535 SHA-1: 20d9ef61ae69e830e16ee49b29e9c96c8c0f484b SHA-256: 2b1ca8763e6b7a7aa69ab3b587e2fd55c014f3726ad5b47b5f09c86d5a3583f9
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to disposable or compromised domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on disposable hosting, as identified by heuristics, further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://go-pxl.com/uploads/files/tazasadodixusizexegit.pdf In PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/444ebe920744104266636479672654d3/45041086250.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/65435803997.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/punubagosibivasaxas.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/17508695717.pdfIn PDF document text
    • http://bakoca.hu/files/file/90533501082.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/piwivubexi.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109100438079815.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/kemosuwela.pdfIn PDF document text
    • http://zzquansu.cn/d/files/61080341576.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/kikiwase.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/90384740869.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109061605092370.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/xogabakevizusixu.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/ribudijadororefujixi.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16131a35c3074c---66715924900.pdfIn PDF document text
    • http://dr-temt.ru/images/file/rodobivewuluxo.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/60242743123.pdfIn PDF document text
    • https://terracell.info/images/file/fozadiverigimurajaxojizi.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/nobuvixawadogulekaxeb.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134452384f29---27889076815.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/kirol.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/db4b0c4c19619e5580fc6a0e5911ffe2/61333276608.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/gasukafuduti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=johnny+english+strikes+again+full+movie+online+freePDF 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_off0000d7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FE 11024 bytes
SHA-256: d428672ad6486fd35f1800732bffc565ed0603e2bb608b0f65947235a2b7e75e
font_01_sfnt_off0000f185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF185 16384 bytes
SHA-256: 7ebd2d93f5bb4424c602ca5a88cda2682815738808421c8f4a74a5765fa5ed4d
font_02_sfnt_off00011ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1