Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e998eea40798abb…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 01:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 91fd69be3b52ceb37133d8e53b60b763 SHA-1: f79e12d1db894b83a677329c8efb4abaf7766567 SHA-256: 6e998eea40798abb44788888e5a22834f36c3b06bc94430ba1d4bb3ed86e7dc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://archism.ru/uplcv?utm_term=bezzera+matrix+manual PDF link annotation
    • http://cuatro-pr.org/sites/default/files/file/39583254330.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160724cf0809c8---61142017526.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/gixudezonebinideluwagar.pdfIn PDF document text
    • http://edgecs.net/documents/20961276873.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/eddbnkodkdfq2bab5k2f47ioau/tamewowofu.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/2ceb9a8362792e581a280a69efad800b/vokoloxovuvaxigegogefa.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/75300901030.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/xuxopo.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/psbiqrrd0gv878i909f0dom4d7/xepolanitan.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/gutokelubesuguvefu.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/nulugifatoruvokaso.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/8896474304.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/kobudu.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35101034725.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/26518009425.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kimaleweze.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/3e5e56a701fcb51ee60f1595c6f871bc/futurogokujigaguxi.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/kexula.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd5ad485c5---3866253257.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/fatubovo.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/mitajewekevobekosaxikosod.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/menozixowidelejeforul.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/wodagafigo.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b90ab516fc4e83ef5324f409d030f0da/sisagikenamu.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_off0000da19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA19 18112 bytes
SHA-256: fb78ad048267d26b23a5cbd2857831a1d30a25a72d0de0b2244d34810ba4e79c
font_01_sfnt_off000108ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12105 10296 bytes
SHA-256: e89950cdc05bcee3d050500ccdea19122960188b26fbd03344067a6ec03c8c5b

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