Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a22694fa87a862c…

MALICIOUS

PDF

76.6 KB Created: 2021-09-10 09:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 94195598c0563fe9041d1e83fb672061 SHA-1: 708f2d0a99be2cf2b1fa2d9d6f442388134427be SHA-256: 3a22694fa87a862c692491c7a07f2b3f4bd55c3734b0b3d1ebccd75e0758ed7c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be part of a link farm hosted on disposable or compromised domains, suggesting an attempt to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=android+tv+x86+32+bit PDF link annotation
    • http://studiofelician.com/userfiles/files/vofewiwufifumipit.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af7ede695b---57954236311.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/piritezokivaraf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613525f20a50e---45638516322.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/13921235825.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/tetalobafisol.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/tozivoriluzud.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/jevulezodoxuzunosogizuju.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/93307650694.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210910145402.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/ridipigofekuvakejufaf.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/zipabofekugaf.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/sidajosadifebuletude.pdfIn PDF document text
    • http://ed-union05.ru/files/file/29739512489.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210907185621.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/sitevururubojurafubenu.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/zaludaf.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/45678642533.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/68921465051.pdfIn PDF document text
    • https://aaaxxion.info/images/file/660201999.pdfIn PDF document text
    • http://newworldss.com/uploads/file/gakeborizef.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613044780d31c---17565352618.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/29400818364.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/sixogovotalebefupazutexoj.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_off0000c50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50D 10692 bytes
SHA-256: a978ed148ab76e6671ccfc4a3ed4798b80cc65f6a973a28881a71e298a6ef021
font_01_sfnt_off0000ddc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D8 18012 bytes
SHA-256: ce68a8fb4ffcb5be217ac2a549568a7c51e81f8cc2b27156cb053b05314f3e14

Open this report in the interactive analyzer, or submit your own file for analysis.