Malicious PDF — malware analysis report

Static analysis result for SHA-256 649167406f04c682…

MALICIOUS

PDF

71.5 KB Created: 2021-09-24 21:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b4a0180b3f1380bd38b4356f61270636 SHA-1: 6eb8d1611e50e9c70f122e03ecebbf43155889e5 SHA-256: 649167406f04c6827c619cbfa48b124b077287efa391dfc7240d7d2b0e5b088c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to create a link farm on potentially untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=mission+mangal+full+movie+watch+online PDF link annotation
    • http://theorientgarden.iorderfoods.com/uploads/files/24644012029.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147ea3476d78---xoworosawaginejubepuvogux.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/vomezanikinamopogujufubo.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/17231669741.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/misufofobidunifon.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/gemomeduxo.pdfIn PDF document text
    • http://kadet-ck.cz/pic/file/89282063936.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///45541036312.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/65080560752.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/sixogi.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/sutinexapozezedefomeb.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/1668779016.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0026a04ef---42508552461.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/10834163265.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/rinisorijemexamegafejiro.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/silavadozefasisasa.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210921201024.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/8fc2bcd0ebe6c5379ff53212f601a1da/fokuronekowapag.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131bbe7b4a88---mufeni.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/57f35638dd8d220e07814cdf16882d94/61753612009.pdfIn PDF document text
    • http://kolesa.sk/files/48174939207.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/99118794416.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/rixulewitajorusilenela.pdfIn PDF document text
    • https://projetovm.com/uploads/files/80327198969.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://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_off0000b541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB541 10928 bytes
SHA-256: 3920ec745f9667d948e2ac12405dae299186db0adb34f7a035fae4e42a085bf7
font_01_sfnt_off0000ce7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68F 16388 bytes
SHA-256: 848a5c82385f447065ee5251ef5baa9ddc3d808ac002cd0b0827dd85db3ba2b9

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