Malicious PDF — malware analysis report

Static analysis result for SHA-256 280c236fbf244d44…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 19:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 25ac5a6d16bbf2c0f025c88cf2186988 SHA-1: 5b1c6bacc6256eb6ea48ae016692fb9802616029 SHA-256: 280c236fbf244d44da67e73db98367781df052813f4c84df6d5e013a49d716dc
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 uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pjteam.hu/uploads/88788833115.pdf In PDF document text
    • https://giriconsultancy.com/content_files/files/xiripexebuxu.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/pelolutefuwi.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/melaxojunis.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/4880064006.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/11295789823.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/48286004413.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/senafenanewezen.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad80e5b0e6---64009011284.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/c0d31c8a2dc621ad6cd365ada00ef1a0/16719554947.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/08832a7c164fca4266db6975c7bdabb6/90226729980.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/sabewudetefakadar.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/78qu8pp8fn66opu3gur7i2kqom/72550178974.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/buvududozudi.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/43999799648.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/65413092669.pdfIn PDF document text
    • http://duef.ru/public/file/wudetewo.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/45975218898.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/d399305193fe608a4d556bd676e4d99d/10080952006.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc428df3a0---68263920257.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/20573662335.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/rksrkfmnhbsdrh3th47gh5ksp8/42061141061.pdfIn PDF document text
    • http://donelreunion.com/clients/5/59/59051ae02fa593b10ab13f41bf6316a1/File/zotapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=florida+pert+math+practice+test+pdfPDF 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_off0000de58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE58 17400 bytes
SHA-256: 58fce657d4d31397f724a9cfe4f3a789220093c203fe4980538b29d47b112518
font_01_sfnt_off00010bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAE 10756 bytes
SHA-256: 93d81b25885777b37a41fb7b54bd0c2c633e1f36e5f10e53fd958586cb9d6821
font_02_sfnt_off00012461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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