Malicious PDF — malware analysis report

Static analysis result for SHA-256 561af07058e0f7be…

MALICIOUS

PDF

81.1 KB Created: 2021-09-07 13:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 523eec178aeffe0db50e2688d112894f SHA-1: e9723f5e20e25db3263783816f9bdaea3267db20 SHA-256: 561af07058e0f7be6a4c36cc13d773550718aa57f05da33e41b8c59bea03db82
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It functions as a link farm, containing numerous URLs that likely lead to phishing sites or further malware downloads. The presence of multiple external URIs and a link farm on disposable hosting indicates a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pistant.ru/uplcv?utm_term=malayalam+alphabet+learning+pdf PDF link annotation
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/77169430169.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/vinazisexexobeg.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/9rkps5us2r8a2dschee9lqmbt2/sowunowukogavakajunililus.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/0f7bd221de16cd7a3019c0c968936ae7/zadisa.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079f8ce9d920---zinevutamukusuvunime.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d435899ba---45778761295.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/fokuzedexabideziwar.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/69419rdbkfvq9o8b9fl9a5vc94/60830170914.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/lesapulegavixeb.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/soxolovenikasufix.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/lisevamonuwanaleboxona.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/31153620306.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/17223505585.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/7029076959.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d4fc35c04---ropamizibopiwupirifupawe.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/f073hq0ucsg3al65n1sp7csj2c/xuribowixida.pdfIn PDF document text
    • http://ausafe.net/images/art/files/vavexamudubakabofe.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/h7mfiuvgq3kp5m9gei6abafh2o/16265985463.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b786eef8be---puwaxosokomeloxekafatu.pdfIn PDF document text
    • http://odumakus.com/uploads/files/75442398361.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/54770926128.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/ec355843e8e2143345df5e6bd3c63b97/2908425536.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f85127452---52364857245.pdfIn PDF document text
    • 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_off0000d068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD068 20540 bytes
SHA-256: ede9e2f0cd19ff2e9fce678261f1236d5033275e62f32e494d1b489d6d8953f7
font_01_sfnt_off00010627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10627 10904 bytes
SHA-256: c565acf369408b48cb43ff1c2ec407d1808b57a55b65b897ef0744bd4cbbd8c5
font_02_sfnt_off00011eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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