Malicious PDF — malware analysis report

Static analysis result for SHA-256 299a86d35b02f049…

MALICIOUS

PDF

84.3 KB Created: 2021-09-04 16:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 870016192bc727f3e26b2a346417e827 SHA-1: e5e6f703e75eea007e845542cfc547544acad3cb SHA-256: 299a86d35b02f04927f898a65264df2d0c35ff4ad9fa2d660f41e95df30587a3
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of multiple external URIs strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://betheaskssd.com/flash/betheaskssd.com/file/risisubekifobi.pdf In PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/6un8qjqjoc6ns6vf825v5f7r76/witakabafurexajapixibifik.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/derazawat.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160acb07ccb642---xifazeku.pdfIn PDF document text
    • https://olterus.info/contents//files/ditufase.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/1182860a45cc26ec7c8d369bfc416b50/60969367191.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/besasumavabezenimosiv.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/1fec973f332aed01c62e3b7ba55a921a/tujodixesan.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b966a5b170a---94028371951.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b76e654f8282d7188cd72c6d67dbf7d/divezofunemomewopa.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/63495255313.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/kirejawe.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16095f7fa20cc3---monafebuwemaforo.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/22747196986.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f49b71f6e---neboru.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/qt50tuhkusu37vubtsphqgq2j2/rojarurejek.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/32177401416.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/79764999080.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/dg9l0dh8sagrusu8vu651j9uoj/71919195827.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/7052c1ad6a0a565f559757a4a2f138f9/turalabiroj.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/3433164609257f883752.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/8ffbe59c1b81ce943397225c9fe1a72a/40500718436.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/jozuganejenugunikesapuv.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/2fc926974994d7f512d736e26c237457/pisilinukali.pdfIn PDF document text
    • http://jfe.hk/userfiles/40743080810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=tracing+abc+worksheets+for+3+year+oldsPDF 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_off0000e111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF928 11324 bytes
SHA-256: 3fc90b0b717a8d8d224adaafba96d617369de78a0467f058d2464e6d3c2521ca
font_02_sfnt_off000113a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A9 18448 bytes
SHA-256: fb6a2a562a85c90a63a50aa5fae56151dee313a36a2274e935e67adc4b49fcf6

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