Malicious PDF — malware analysis report

Static analysis result for SHA-256 02b3cda99cb9ac2e…

MALICIOUS

PDF

93.0 KB Created: 2021-09-15 13:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fbff47f2a1dfcf55fd151a59f2f2052c SHA-1: b40d14d84929e57f9c9d2932721df76578111bea SHA-256: 02b3cda99cb9ac2ea75a3b269268e6bf3354f94019aa296a4840e0bfd4ebe9d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://testgit.begurholidays.com/uploads/userfiles/files/16314510995.pdf In PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/2d54d6dcf7818f01d7bd6b53168cd195/jasibexem.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/22483552857.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/9631827398.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/kivivezujukuwizelokaxuzek.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16134a88ba7c35---tizibam.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/86678616075.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/57ada647dc0682e91e5af14c4dc8cb6a/jodosurarikirer.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/44b0bb1dd2abb9a5842816e809a1b807/wafido.pdfIn PDF document text
    • http://indemo.pl/Image/files/fenewikowajapitel.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/puvewetimimudigabutiravu.pdfIn PDF document text
    • https://limsurempat.com/contents/files/97009850834.pdfIn PDF document text
    • http://kechengchem.com/upload/files/76227157706.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/86967692678.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/xisapefabezesajegejigo.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/27480707811.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/12611501488.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/32847333560.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/3397274848.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/kukigodedafinobiza.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/7349735582.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/15352388121.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/99164374633.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc635e6fa2---wojivuxibegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+spoof+location+pokemon+go+androidPDF 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_off00010461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 11132 bytes
SHA-256: 590a82b2719df80a2399e4f97a7b88ac203c6ed146a424178bb27269b6468108
font_01_sfnt_off00011e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2C 18344 bytes
SHA-256: 1cbad47b2d2b954f83501301871d927c2e4637a17495918709bf1b3ad2484a9a
font_02_sfnt_off00014e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1