Malicious PDF — malware analysis report

Static analysis result for SHA-256 231c2c8c23bb51e8…

MALICIOUS

PDF

80.8 KB Created: 2021-09-03 16:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 05f42edc96f90ac4cc298de76126df45 SHA-1: 0603a654352bcf186eb86842dd6cbd9948050c13 SHA-256: 231c2c8c23bb51e83bf6a935c9f446b52ccdd57fe93b25f1a1346bf2367912c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nstoplana.rs/ckfinder/userfiles/files/17257764393.pdf In PDF document text
    • https://ecohort.info/userfiles/files/fagivopusad.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ucdj0cvi7uj13sqflq1fqef6bi/xipivirepuzen.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7a0b06b69---36780178032.pdfIn PDF document text
    • http://chpcentre.com/files/file/doragumekudi.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/kevewobenixofa.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e87752aff6---siseregorabetepakufubasa.pdfIn PDF document text
    • https://ebooksweb.net/files/file/zotigixowegepanidibewabew.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/zerugumexixivajageko.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/rorugojamakuzugafit.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/sowidiladum.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077f461e9bfe---85859885690.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6d659e9e7a1517be0c2142055af5f641/61566417569.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/35351267494.pdfIn PDF document text
    • https://12tiga.com/contents//files/bozulefabefeteporidar.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083864cc810b---35320873154.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/55692367932.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e944b2204a6---gapibimil.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/gikur.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160f2c27ea1647---9580242280.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc37622242---19429031126.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ba240442---daxemekojejus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=extract+data+from+pdf+to+wordPDF 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_off0000d8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BB 10412 bytes
SHA-256: 8cf4eb9d098f2ac9877544b53b093377b174015b5409ab77844d46f353c444bf
font_01_sfnt_off0000f06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10880 17376 bytes
SHA-256: 4c7fcbd1e1c05484d7765457961c43bf5297fdd46ec3c6fd65b3debb4b62089c

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