Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3250e3cba53c05…

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 12:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 31a53ef40c480830cf8e9787889d022d SHA-1: 20bdd801487fc3468bfee746a94a897b7ca4aff1 SHA-256: 6f3250e3cba53c05ab1cc6f904d94a9a5313a6d7b0bfff672ef6b18112295f08
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body itself is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but containing embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://precedent.by/_newsite/images_from_html_editor/file/feludaxajaxulazalo.pdf In PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/xomadelulejolej.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/8c145c6e0f23a1f71f99a4f563696d84/36668409353.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/61196428098.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/674ac1e06c78df3da6baf577346fd20b/61338317142.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210627185352316.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16107172ee76c2---65406988852.pdfIn PDF document text
    • http://lg-palette.com/upload/files/20167240887.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/025vbbitc9p4plruc8fpgp8q31/85441760382.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/57120645594.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/n4bsu2685jaaa9bluid9saghhr/99423799276.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/leniviwogozina.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/89899445491.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/45374020529.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac666762c97---xazulofeviku.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/49a7f2143a96d523438a2a6c482cab9a/lufoxesoxulibofajudeli.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16074c16c00d88---girirezevadogakag.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/zixodupetebira.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/636950165.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/sesewuvawuvijarolagizale.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/26844433554.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/i5pgmboa7v41cs85namcg7mm30/51469995483.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/80239065324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=algebra+worksheets+solving+two+step+equationsPDF 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_off0000d42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3E 18436 bytes
SHA-256: 61e82548a9d09cb2449af912c756b869c27da8516c5b30ae578b6d0b55a7a03c
font_02_sfnt_off00011c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C75 11140 bytes
SHA-256: b8d7c55f2e7537aa17d141e4cc8cf14fd340e3bf2956d0e8e6f950fdff6e0640

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