Malicious PDF — malware analysis report

Static analysis result for SHA-256 b452576a0f0fa026…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 04:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2133254c3bfe9822f0619c70b48a11d5 SHA-1: 7d01d1ba5b07b57e199fafd9188b99a559ecaf21 SHA-256: b452576a0f0fa026b664661e0815a8b27d9c912d0b79d501cb5c061f34d525fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://lonerangerfanclub.com/ckfinder/userfiles/files/vapivizejep.pdf In PDF document text
    • http://akconta.com/uploads/files/10913344713.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/du2a3mf34nq5ddjrktssim29fg/vokugunemafem.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/02d120658d996660e535856835382d45/57779449656.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/damusikikamupejovili.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/24630298536.pdfIn PDF document text
    • http://immopolignano.lu/images/49192440302.pdfIn PDF document text
    • https://mytopics.it/uploads/file/10620291228.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fc4266276---2693595041.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///22924895576.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/64462076933.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4798439ce3fff6b217a6cd37cada46b2/zogapuboru.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/42177369325.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071a771a5f61---1512818370.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/o54bisn0oe7fu38757e8oh2p67/zibowesidozama.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/66085692983.pdfIn PDF document text
    • https://tepihtrava.rs//files/46323038495.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd4a20b27a---dakopoxelujotejasa.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///jasunavewikukijonoweb.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/174f04b73c2f1cc99995b5f8ecd01cb0/70131678250.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/86528058211.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210517030920264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=foot+locker+job+application+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_off0000da4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4A 17700 bytes
SHA-256: d68277e0856b8e67513509f7ea98e97730db4b41d3b7aa45d13cf9339b990769
font_01_sfnt_off000107ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AB 10784 bytes
SHA-256: 89bb2ab866187eebcd0133ffe2a756389e76f9cf08b352e1c598e24e32f21ce7
font_02_sfnt_off00012058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12058 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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