Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f9320028be9477a…

MALICIOUS

PDF

77.0 KB Created: 2021-06-08 20:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 97b71dc98ae532ad756e7b938812c4fd SHA-1: b3ada6be5215f18a03ef8e35b0624df23476cdec SHA-256: 9f9320028be9477a809912f43065ffef8b0774e09d0643c1a43d443d33ab7c6f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded URIs are indicative of a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://queure.ru/uplcv?utm_term=restaurant+logo+psd+free PDF link annotation
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/a6b1ed0e00b719feb9ddca82ba25d627/96163055165.pdfIn PDF document text
    • http://contextuae.com/resimler/files/88754063531.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/8ce564eebca2ded7cc0b854280092e31/84698860671.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/nupujesakamab.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cc89ab1ff---nuwobuxefeguvawiw.pdfIn PDF document text
    • https://luminex.pl/upload/file/wolododuvutukikulir.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/15313252887.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/0d0b68f54de3e96e1eac20eda832fe57/saxulebiruwubu.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ac216aa7e2a---38918493445.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160851434a0020---59106025093.pdfIn PDF document text
    • https://arerp.kr/data/file/%5C/banalugebodaberem.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/a38b86bd5cfd215aefb94e540a699d06/56022333557.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c859286f9d---41475684823.pdfPDF link annotation
    • http://kryotherapie.net/neu/userfiles/file/25363187095.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/paremevaperado.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/19651726996.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/55482584085.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22F 5216 bytes
SHA-256: be685abd9e42ce03e3b591ee0485cf4570e90381b94352975f2af8ef61ba0809
font_01_sfnt_off00010405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10405 10372 bytes
SHA-256: 3ea5f199a7b46d7e0e47f3de29cd4fad0b1f0caa05f63adf43cc540363a17eac