Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef14fe88ad0cf91…

MALICIOUS

PDF

85.1 KB Created: 2021-07-14 05:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 478fb71659c4f04c1d2cc480c0918504 SHA-1: fb22b69c330d18ee507b8bfde58a95320e5be3bc SHA-256: eef14fe88ad0cf91695f0a4c1aa87737b073bb440cb3c7da1dd76af40eda3b45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The primary attack pattern involves directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://irlanc.ru/uplcv?utm_term=today+i+started+loving+her+again PDF link annotation
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/8d7e7e387cbec46800101c7ce3e8b826/61790050900.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/mowiwafiderepuja.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/mipenutedarolowumumowibow.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609093fe33103---sepaxokag.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a55ff3635d3---dawuxeditevizesonaxenetib.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/91879202859.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/10780156962.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/aa129635de1a4637e3feeebce062e449/7624609396.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/gexawaxaxulibexunal.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a02e909247---xovosesekunikagukuduzajom.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-22/20210522182820683353.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/pvhh8hdh2egjrvtslmjl2todh2/digozurovavuvenididumu.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859acb74acb---11629166810.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/llbd4b9pgtqerq86sudi0fe5vv/21666870481.pdfIn PDF document text
    • http://alkanboya.com/files/file///7930687579.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/zavubakenev.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609033eb35456---neneligoxo.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/nurutinawavuvivamedu.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099074d14337---59678468426.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/dewirifiruzu.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f50130e8ba---78806560047.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_off0000e98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98E 10668 bytes
SHA-256: affdc3823aced4e4d7aff44128cda5ab11f0ef69933cc22f1f7e1ccba841a283
font_01_sfnt_off000101c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D6 17496 bytes
SHA-256: 85ba9daddb69a98a7adcb3fed8872080a09b2ea337d9ee98db8775fdad027f0d

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