Malicious PDF — malware analysis report

Static analysis result for SHA-256 40bc70d054507aa6…

MALICIOUS

PDF

87.1 KB Created: 2021-07-03 11:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 713bfe023947b01ba114bdfec58186a5 SHA-1: b9975181678581bd50421712a345d6cc4a814934 SHA-256: 40bc70d054507aa61dea80d8d294d89f39520ba66c52032da9e2b3e28b7a1688
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, are part of a larger pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eb7b30634---78633893150.pdf In PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f23469b27---wilap.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a06a8e777e8---19781480169.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/wetebo.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d8dacfcdc59b64aae422c60ce38e34f0/rilakugefusubo.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/godube.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723547f2bfd---fudovegefimurowuxewebe.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/99807909664.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7e17837e3---80053566529.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210611105307_1076508500.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/pesunanis.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/ef820ebada94bddb907b2c7dc2caf4e6/rojukovediputovizusove.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/87243234720.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/labunuvisinifutedajiv.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/adb0e5s54thclefk0lkt5fmfjn/52662079354.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cda22a078---laruvufe.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/c10scnjv1pqrhp32tii5iothn3/rigozelalejun.pdfIn PDF document text
    • http://abnicum.com/files/file/bifefegevupa.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/kebezobodeguwus.pdfIn PDF document text
    • http://cjatkinson.com/userimages/dilovo.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/62513983283.pdfIn PDF document text
    • http://kleiberit.ru/files/file/13317680955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=game+of+thrones+s8+downloadPDF 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_off0000f11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11D 17504 bytes
SHA-256: 48f044c9ab3c78fe1e6c04d2c43cec632724f335c79fa347f490c2894d48375e
font_01_sfnt_off00011e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13686 10860 bytes
SHA-256: a1def703fc16e681d00ef8db0661479c56a328026d8b2635aec9fe5613dce6b1

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