Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f12739c96243e0…

MALICIOUS

PDF

78.2 KB Created: 2021-09-19 06:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f02fd505bf2278883617bcbacaeaae27 SHA-1: ed6d4c5ad3e9c74ca7954850cd5fb37e5d215c74 SHA-256: a1f12739c96243e0581e090a0410396300bebeeefc95f4e2c72db71e5aa2c3ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are common in spearphishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://irlanc.ru/uplcv?utm_term=installing+apps+from+unknown+sources PDF link annotation
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/82251632582.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/buvigalegonarukibapojab.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/nolilozelivovevi.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/47832071750.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/voxareka.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7120efe69---88671448428.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/gezabateli.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/ce36ba6dabda630ab9e11cc604c0275b/gixafidadofexezuvepaw.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mudebabadazafoj.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/nexikijiledaditejadavotiz.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/41273072523.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/74845601913.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/gowenolevujotixe.pdfIn PDF document text
    • http://innotack.com/userfiles/file/gizamenorovokubijeveguva.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/modelosemawewogozakoxir.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/sefavivegopaki.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/72679122845.pdfIn PDF document text
    • https://www.miotsukushi.or.jp/system/ckfinder/userfiles/files/sufiba.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/d6e2db4a9481c979382c0fc6af1a8560/zaridefojono.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/zijekudowedodu.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132b146d7f16---zokomozatejonivikevakizo.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rupixatetikupa.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/1794716612.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/peregukasimosoxetipeb.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/1729197403.pdfIn PDF document text
    • https://ms1oke.com/contents/files/berifoju.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_off0000cb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AA 11052 bytes
SHA-256: 6af891713078af998bc30708cd9210c7178b3dadecbe7bc9d946eaf56bfce8c8
font_02_sfnt_off0000fd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7D 17320 bytes
SHA-256: c5be74d654804b02a188e7d16eee83b9debc7a8a17a3de1b0f8054d6b7aa71ca

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