Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3a0031da6048c9…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 16:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a1ea3c2d71715964a4a55548aa988f8e SHA-1: fe022e074029a69d1e17df6597dc7ab352579d0b SHA-256: 9d3a0031da6048c9ca0a08f86d1b9ad625ea98cc3fffe600c2afbefee6257972
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/g9op9q84gb0fkfg90f9ahf108q/vamokiz.pdf In PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/luguretopazidotavumibiv.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161354954b9640---runazamudo.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/90251874965.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/gonakomir.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/rivikipujeraga.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae017420d---99278148070.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/64074064226.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/2381401353.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/losetedujiwerigetanavobu.pdfIn PDF document text
    • https://ahha.az/userfiles/file/38810045623.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/47223893033.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/zedilomapulobolexubawop.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/soresuredotutiravip.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d72c865a6---mifanir.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304ab7e9a6d---44969654928.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/21222048895.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/kapewivibujuvafulabe.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/13098740105.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/niparonujozukodiwimam.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/pagofop.pdfIn PDF document text
    • https://domilot.com/uploader/files/55382122886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=homelite+string+trimmer+manualPDF 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_off0000e07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07D 16992 bytes
SHA-256: d1b0d4122dccd0bb0a14c16a79b1cbc43b92d36e4e272e87de4c82efbb796e5a
font_01_sfnt_off00010c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C99 10540 bytes
SHA-256: 3e0005def06b330446a0399e5228e2a58daa2670b600b165eb7b78a211059b59
font_02_sfnt_off00012492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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