Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae59a07184831ec…

MALICIOUS

PDF

116.5 KB Created: 2021-09-01 03:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a75a9e6f2f362f9bb1236961f48c27d2 SHA-1: f0591dd80f2dd3de1755b22f3e15365748e96f1e SHA-256: cae59a07184831ec1358fcd4af9a29a3e2599f5b902307e3f6e26baae7ede581
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links are consistent with a tactic to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8386

Heuristics 5

  • 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
  • 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 http://huiking.cn/uploads/file/180351176446.pdf In PDF document text
    • http://nct-vn.com/userfiles/file/bosomubaxemidabafapoxex.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c948aa2da5---4203005028.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/b030e9746efb0fefa4b9c12aa4567c3c/22916100242.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/94178242762.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/78890007337.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/25050460243.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/9219303675.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adf229d5d38---78741402372.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/1mkgg3qcsrjg85kjjd778vbds3/rodaloxodase.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/37720303778.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/29811875557.pdfIn PDF document text
    • http://groupkaishan.com/d/files/35300068783.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d3d005817---55961607019.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/53283021157.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/568a7d1c417245efa4184bee24d5efd7/fowokibekafaxizeduvufoso.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f901b2eaa---16980635962.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/83234155977.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/18686134913.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/puluzazuxaxa.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a1df022db80---tosizimigopun.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/47215842677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ability+meaning+in+bengaliPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19ECD 10296 bytes
SHA-256: e54779dbbc73a7d4c754dc1238dd60f5fb0a75adb8ee09652885f79057b8ad80

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