Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0316ba0026024e7…

MALICIOUS

PDF

71.2 KB Created: 2021-09-25 04:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 48c9048210886b95f03aaa3223569791 SHA-1: 3b4d723d67ac6f2a506b98e3913e20028862a0a8 SHA-256: e0316ba0026024e72de1ba06594da1a1c9b20652544af235e58880707b64c364
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS upload directories. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://miraesusan.com/ckupload/files/roxujomizusejozut.pdf In PDF document text
    • https://path.mn/userfiles/files/logoveteridunoropujafer.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/57920863553.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/rudajikikasigetususim.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/wiloxezigo.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/79896010807.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109180753284220.pdfIn PDF document text
    • https://pactforfamilies.org/ckfinder/userfiles/files/14619085475.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614b60e60b88b---powokiju.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/sixugemire.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/dunojesanuxiluf.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/50575696486.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/97363127686.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/9b34df097ea0798d9459ddf758691d9f/gajitupakesol.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/romabekujavizizuxebe.pdfIn PDF document text
    • http://net-marketing.hu/images/files/81989197484.pdfIn PDF document text
    • http://nprofit.hk/userfiles/57877261684.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/jbhjbtpekkcj5osoanu79b6057/50748914124.pdfIn PDF document text
    • http://sial.pl/galeria/file/nilejufokupekugekugetit.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/66958758765.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/powexiwe.pdfIn PDF document text
    • https://landi-bg.com/images/file/jujufezemojiwegafuwez.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2ecee621c---21952838024.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/rosotizuvazi.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109181317181552.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/wujevowegufolegilanojiz.pdfIn PDF document text
    • http://humanlitech.com/files/files/32366033419.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/46113127010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+share+contacts+from+shareitPDF 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_off0000b771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB771 10632 bytes
SHA-256: 3f45d17789e7395804adf274f2bbe1ca592685dd953ff9de4992ef0071a74a71
font_01_sfnt_off0000cf9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9A 15648 bytes
SHA-256: 39f738a34adcefdda88a020dde93dbf818223e38022007b6b08fdb115ab6159c
font_02_sfnt_off0000f6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1