Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd1e66dac1f45c2…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 08:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5208e7fdc6f5e5caa2774e4bb9948396 SHA-1: 1094715deb579b2fe9f83ead38abaac166cdf42e SHA-256: efd1e66dac1f45c2326a3dc2d7ddf637fccd2370339c2367912655b66147e9f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the primary attack pattern involves luring users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094041dd0be3---telesanilefura.pdf In PDF document text
    • https://echipamente-scule.ro/userfiles/file/mexopebajudikowapu.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/17024149264.pdfIn PDF document text
    • http://proxima-design.cz/files/file/60532379833.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/81342870124.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/aac8c0c164379ce484a802a572b77936/74720309471.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/68469665291.pdfIn PDF document text
    • https://mmszke.hu/files/file/xogelasuwo.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/tikevit.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/35381498855.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4687e3615---fimixutabatodowex.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/votofefitosuvum.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///25324543337.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/82061374368.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/24034736521.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe905afc6e---tubatoti.pdfIn PDF document text
    • https://schlosshotel-murten.ch/userfiles/files/nabunarenik.pdfIn PDF document text
    • http://www.olivier-frey.ch/user/web/file/61257463479.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec34ee6160---90573983193.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/db6epra6tdtu265vifq7g68qce/50384629215.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/97ae9dbb99fa3bc3608e690106f0cc8c/belunakixi.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/18178049641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=convers%C3%A3o+de+polegadas+para+mm+pdfPDF 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_off0000d115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD115 20020 bytes
SHA-256: 7c247c97d2593555cdebe6d2b6a0a4a4bc417a2c02d5c11838c04ea29ed6f74c
font_01_sfnt_off00010395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10395 11012 bytes
SHA-256: ce6be1a9099c3c794dfa8af8dd069a7d15ec2038f1a0d6eef5a23c6a6cfc1353
font_02_sfnt_off00011c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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