Malicious PDF — malware analysis report

Static analysis result for SHA-256 841b3cc0bf13a1a6…

MALICIOUS

PDF

82.2 KB Created: 2021-09-04 06:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cd7623a4552436c0ac6d3078de45e0ff SHA-1: a625bc715a73e0f2e69497f9174fb00bdac1de8a SHA-256: 841b3cc0bf13a1a692ba1f09bbe8aeffdbfbc047bb13cd67bf486bf0cb45b581
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/r09d9s2dm8jsnbdlt5otk2mq1m/95226066228.pdf In PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b6dca5f7f---mazetaje.pdfIn PDF document text
    • https://comiconfezioni.it/file/74445844842.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kamuwuv.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/17311853068.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/lapugawixepikibojisa.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/24768700416.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/fovagasasisebedasanapad.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/xosigurijikel.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/ac8083ad4c7061b8a14488a1fce63757/kuposelamijetudimub.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ec593296d---vuralanoli.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecab059b991---47866729814.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fb49059744b---20723456988.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/50667492414.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a8f64e038---17417110896.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210624144903930761.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/xepixejojopipowokas.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/fezanediravewoduxi.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/bawidaroguwonunirevusepog.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/45187279939.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/damirezot.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/nitetugawogujivenujogagu.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/bc5025831c53639ab9df7c2031221ab9/41049364518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=lighthouse+keeper%27s+wife+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_off0000dc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF470 10736 bytes
SHA-256: 8845a8be47c14f10e03151420b39b3138a37f2ea25c467e3aeefcabfb655898d
font_02_sfnt_off00010d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2A 17684 bytes
SHA-256: 159a4e315350f6c3e173b438116f98192a86dacbba0576d5a38101072850e7f3

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