Malicious PDF — malware analysis report

Static analysis result for SHA-256 13375c0a775576a1…

MALICIOUS

PDF

76.4 KB Created: 2021-09-12 04:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca64fcc665a1f7a92c4fe79be2c4faa5 SHA-1: f36ed2703b708ec7c990beaf71d0999781c6e8ce SHA-256: 13375c0a775576a1e225481db56d42d570535f41ea41a41c13f6da8fdb935f34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://tuzy.pl/Upload/file/29693100546.pdf In PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/3df7cd646c3141e1fb02b334de978d71/66127421109.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630594334_1.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/21721833230.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/38218226577.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/1987632803.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/06/file/12513931440.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/39128027495.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/mexomaf.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/18726666042.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed06807d84---87936871443.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/luguwumerope.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/77699795498.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/uhd1f84n76dibok2f3ds1j7ekt/1130417308.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/10610314449.pdfIn PDF document text
    • https://insp.biz/img/file/89239874799.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161376b421a53c---vuzabijojebugajanomene.pdfIn PDF document text
    • https://somogyplusz.hu/files/54023556412.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202193194699482.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/zilivekisi.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/46542942768.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/36526045293.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f32a28c47a---11310119056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=magical+mirai+2020+nendoroidPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/98755556657.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A7 20152 bytes
SHA-256: 83f399abee3748259bb45de6d662c70af4e628c333bf15da20956a4599de10d4
font_01_sfnt_off0000e895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE895 1936 bytes
SHA-256: 9aeb06937c81a5c56cf99af8deab830259c8e7bb488e779e8e638c33337cf583
font_02_sfnt_off0000f190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 10684 bytes
SHA-256: 3095166c8a359c003aa0ebdec82acb6cc48d2adacf0a0b3f4ef42a9433aec5a5
font_03_sfnt_off000109cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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