Malicious PDF — malware analysis report

Static analysis result for SHA-256 681b89f8eff36e62…

MALICIOUS

PDF

161.6 KB Created: 2021-06-20 20:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d3f4a31bf932ecb0f13281d8857aece8 SHA-1: c14f0b5abc641164a990e9e35b9e222e87e083c3 SHA-256: 681b89f8eff36e6226f0f7701767ee36acded4be9251352c84b9be828ff56305
164 Risk Score

Malware Insights

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

The PDF contains multiple links to compromised websites, specifically targeting WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to trick users into downloading further payloads or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/68ca6lc2loe7h2bmqgj5hlovfo/93556910036.pdf In PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ac25942f3---tawewoko.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c62b0fcd638---54026377117.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/o9t0q998e21f8q9uk2qqtured9/wojufizoxirefagalajet.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7d13c8389---wofepibun.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/61b1ce456617dcd3c32dbb7de539e545/80133666129.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/c8nicqhut2guqls019r2csit5i/22587740992.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6e0c70e47---mosevimi.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b58b65cb51---sorediwodereloniwurulesad.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/2f5ce2c96899818ee6136593da5d7aba/55584771644.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/rrk4o7rqtcllihqk0hrhpf3t94/82240950100.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/jupebetone.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/momogudiluneno.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/16k72iqe0i0dovt8h1l2q90f23/46160638719.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/76297283808.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=aim+trainer+overwatchPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000232d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x232D4 3596 bytes
SHA-256: 180d15f479e92fc877b0b1611548ffdd8196137249afe370e90e319e2875bc11
font_01_sfnt_off00023f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23F9B 4968 bytes
SHA-256: 7aeb192c3639559e68b7660c005378068ae8f306c5212ef659926d0487f35592
font_02_sfnt_off00025068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25068 11812 bytes
SHA-256: 97c1b75d5aa08711d96826b9cd7eaa0b3040a83c61b7888d6dd8b200bc8980a3

Open this report in the interactive analyzer, or submit your own file for analysis.