Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6adc9265820d4e…

MALICIOUS

PDF

76.8 KB Created: 2021-09-15 21:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 14176267bae026419b40ba37078281da SHA-1: 9fb50c4766fb2f1572b2af522711951cf3bb053c SHA-256: 7a6adc9265820d4e9f3221aa889f12b13ddb0dc6869c4763f3f5eca67e0848e5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farms suggests the document is designed to redirect users to potentially malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://oniceh.ru/uplcv?utm_term=hex+a+to+binary PDF link annotation
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/fuxabonisoxoborodavefozip.pdfIn PDF document text
    • http://a899.net/userfiles/file/62532735189.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16135dedfb8323---zebowuvivezeperemeg.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/0ffbf1b884659f66491126a050101698/redizufawedejukatawuwubel.pdfIn PDF document text
    • http://poultech.net/d/files/guvenigix.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/zigibapiwusowavirelezotuj.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/84544522932.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/21297161190.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/41552986670.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/81895675106.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/71338756665.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135889099a0a---gadif.pdfIn PDF document text
    • http://bubb.cn/up_file/file/52177565518.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/91615631592.pdfIn PDF document text
    • https://bor-diing.com/upload/files/kavonojodajoritigumukis.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-11/20210911201134809374.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/dirivowimerupegag.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/96144941331.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/76874437176.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/dabivawegalazonadux.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/wasuzanudamugejevilep.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/wugutidikupegagodenule.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210915_145545.pdfPDF link annotation
    • https://northcoteplaza.com/userfiles/file/80886756295.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_off0000cd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3F 16112 bytes
SHA-256: 473fce00aa616fa73e57b19a1034d92867416cb40ce09cd9fac60e5946c3f6fa
font_01_sfnt_off0000f676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8D 10232 bytes
SHA-256: 7c75b7a886c7709aab24cb21d2bf8de09ca1c7c765c6b69f782f4411ce112e9a