Malicious PDF — malware analysis report

Static analysis result for SHA-256 44117d82436b4e11…

MALICIOUS

PDF

69.8 KB Created: 2021-05-19 10:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f090251fc588d0741942254285432ed4 SHA-1: c62e1bcea2644276785f401a1e8e23bc7dff2d6c SHA-256: 44117d82436b4e1117a1287b1321afbbc23734c93d164f4dd4c1f4319620e50f
154 Risk Score

Malware Insights

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

The file is a PDF document that contains a link farm pointing to various PDF files hosted on compromised websites. The document body suggests a lure related to 'Outlook web app login work email', indicating a phishing attempt. The presence of multiple links to PDFs on potentially compromised CMS uploads, coupled with a high ML score and ClamAV detection, strongly suggests malicious intent, likely to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8239

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 https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/abb9788819e5ecd8fdbd3def4d1b3cf0/fexejizezado.pdf
    • http://adabaskimerkezi.com/upload/file/loratofo.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b98b50f07---75503968675.pdf
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/befutotu.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06d27f7ac---50136078682.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a143d151311---vunuzoloziriwixi.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/6480cb0f6f7af8e4ac406ae3f7d71398/xovopusadalatefumam.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b000292c1bb061e773dc4841f86e17d7/pawanifisixaxilunikake.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806214adddd---48939954272.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071517e74977---88433774527.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/4cb8e6aa5c10e8c7d08adb65d0110ba4/63188747185.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608331ad9ed63---90272072455.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/e2ea88c3d49a486871dff648985001cf/zerud.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607379f1b468c---30299025635.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/cd9733284071b4af64667194e4ea86b8/17112192344.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/e287ad59be1c49bcc5f2605bb42c25ad/49631350183.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160849ca9c4270---kapalal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=outlook+web+app+login+work+email
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea3f.bin
804c82302b2a4e6e9189bfdcbd210e91805ecd19151278fe9ea5d5096e0ab9e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3F 5284 bytes

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