Malicious PDF — malware analysis report

Static analysis result for SHA-256 01555446273c5e7f…

MALICIOUS

PDF

78.8 KB Created: 2021-09-15 03:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c4a2ba387e98d6bd6a580db692cd803b SHA-1: 4f67a8f4d61f0fc37c2b90086a8027d1be0b1565 SHA-256: 01555446273c5e7f28080b67c70c129e0db362d37c6a6b9f601441e7d280a57d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous embedded URLs, many pointing to PDF files on various domains, strongly suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://flixgolf.com/ckeditor/ckfinder/userfiles/files/rimalamolox.pdf In PDF document text
    • http://taiwangallant.com/uploads/files/202109110032214978.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109122246209500.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/54579484209.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/nikarotor.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/japidin.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/12384695302.pdfIn PDF document text
    • https://baptistfriends.org/media/mukuzof.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/fexapakegajuvuvobevu.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161339880a4261---151055616.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/duvax.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/14883005213.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/09dddba457baf2a90c90e7c496977105/61592497665.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/turusivimevireladixi.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/24321297070.pdfIn PDF document text
    • http://irollee.com/userfiles/file/wejaro.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/51854792533.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/4241863047.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/47569537504.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/kogekum.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/25239410188.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/kegejaxoli.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b6a070152548d5a9352271a0a9f1016d/dilojomupebefujazikepel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=speed+vpn+2020+apkPDF 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_off0000cef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF5 10236 bytes
SHA-256: 12afc8a61022593c3585d21255461ef0612916c0c0452eba129d7f30131c75e1
font_01_sfnt_off0000e629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3B 18448 bytes
SHA-256: 697774820a8c73be551fc20057bac5fb9203524161fe4e9d81123738cb7b69e0