Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ac486bb005fef6…

MALICIOUS

PDF

84.9 KB Created: 2021-09-11 20:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c4734ebda442469e9213031e15e215a6 SHA-1: 3b4e5e5eac2510f94739e33a2472e632c468975e SHA-256: c8ac486bb005fef6cfc0ab6706bc20748ba912f7c9f0e788424d4f0615802dd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised CMS uploads. The presence of these links suggests an attempt to redirect users to potentially malicious or phishing websites, aligning with the 'Pdf.Phishing.Trojan' detection by ClamAV. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://inwebjor.ru/uplcv?utm_term=android+set+wallpaper PDF link annotation
    • http://lncxjzxxw.com/upload_fck/file/2021-9-9/20210909041956212208.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/87803185841.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/buzilogijak.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/68229233097.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/96102649795.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-5/20210905025850400520.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/07f4974ae21727ee501f9674a3c223c0/gilidowitiporobogenemugu.pdfIn PDF document text
    • https://businesslife.com/content/files/waginax.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/fpn81m9j50p7tv29mdp40qdqp5/fuledi.pdfIn PDF document text
    • https://subded.org/userfiles/file/14878221305.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/70650621798.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139814550554---15381995114.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210908061007.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613870d7a121a---jovumukonabesududuwela.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/24866876375.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/ligurazenapu.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/gusinaragasulo.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210902045759.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/10188624313.pdfIn PDF document text
    • http://xprchemical.com/upload/files/15154971785.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/6938d3fa637f7be979bbc75d383b8a8c/gagivepoxe.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/bixul.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///gufavo.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210907004853833511mtc98.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_off0000e99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99E 17152 bytes
SHA-256: 1299a25baeeed10b4cbb4b2b613c1abbd94ab32194f7c701bf04a264a14065e6
font_01_sfnt_off0001160f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E26 10452 bytes
SHA-256: 4dd53a554077a62bc00d64e8a65a54ef50503c3f41cc0362db151f1517a18f07

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