Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17a7655962df39d…

MALICIOUS

PDF

87.6 KB Created: 2021-09-21 14:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b977276920bc4120be412833b9fb10f9 SHA-1: 021f42e575c8b6a4e9589a2abf61501010a1653d SHA-256: c17a7655962df39df8d88ec7f3b34d92d84dd8933978e8eeff03eef7103e46e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, some of which appear to be compromised CMS uploads, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wsmr.us/userfiles/file/vegid.pdf In PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16149276f90857---50297854001.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16143e28cd42c7---xelunuw.pdfIn PDF document text
    • http://aurora-c.jp/files/files/guwonaguwezipobaralezak.pdfIn PDF document text
    • http://precisao.org/files/files/logutifawademasobiwedepag.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/tunagudubugilawexebed.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409dfb91d96---sowukerodegufinidumoze.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136a108f3439---nelumager.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/mizigolajagifeluta.pdfIn PDF document text
    • http://leguido.net/files/nobanawasadebuxolarufe.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/waximiketujatamum.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/49883968047.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/muvotum.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/75006273302.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/86293697944.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/15284265492.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/zomapoxabukumujokigenogi.pdfIn PDF document text
    • http://15881588.com/ckupload/files/sagidoremetorusopodek.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/7292314608.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/2655532709.pdfIn PDF document text
    • https://ms02bet.com/contents/files/jefozivovilod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=watch+star+wars+the+rise+of+skywalker+online+free+putlockerPDF 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_off0000ed53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 19032 bytes
SHA-256: bb1ad66e7dcfe79b64b65ed390480ea003989887692ad9c3689f70aec7dd3dc4
font_01_sfnt_off00011f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1A 10964 bytes
SHA-256: a7ae5562d428b8326f1719075efc56b58f7ad74d4717b01558b3cc80ae74ab68
font_02_sfnt_off0001389a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1