Malicious PDF — malware analysis report

Static analysis result for SHA-256 660acfbe0b0af833…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 04:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 66a9a7de35f75fa1acdb7071c357ef74 SHA-1: 9d1f5d069e375697d54660712bc5c803c40f1430 SHA-256: 660acfbe0b0af833a921b6ed9643372224396be3ed740841ba9fc1e9cb6b6c8a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The embedded JavaScript likely serves to obfuscate the redirection process or initiate further malicious actions. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • 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 https://drafthe.ru/uplcv?utm_term=mental+math+subtraction+worksheets+grade+5 PDF link annotation
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdeed2188c---17108707074.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/nitukatebapezurovapaxav.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/tatavoxizotofazik.pdfIn PDF document text
    • https://rajakedua.com/contents//files/giwili.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/8050801689.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/0f81d32358629efb3fd7967b7a1d697e/88353300118.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb75ad30abd---xidefasen.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/limumigupup.pdfIn PDF document text
    • http://homeopathyhk.com/files/dimafit.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/zujipevopemumirod.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/lasibuxusor.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/euo5t2d27tm7lt16u4emfr7hds/sedojav.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/wamonorovatojezubozali.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/65588321074.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/1e8b7f2ac6f551aa2cff8f614b3a0088/3243420781.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796ef64b9da---rudibubineferovumijodak.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb6d55e50e---sulox.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16120e3f95e3af---mebiji.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/31195068842.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/pivujokejafe.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/81289388073.pdfIn PDF document text
    • http://mutitar.com/user_img/files/vuruwaf.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160829789ce487---64243010348.pdfIn PDF document text
    • http://elma1.ru/!upload/files/69526734986.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/db20d666b57bf059597bf819ecbea793/lewuvobiz.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_off0000d50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50C 11364 bytes
SHA-256: 5ba68ed6439c0fae097e5eb6f6a98e4fb60d9e09180909ea00a29ec36889d555
font_01_sfnt_off0000ef80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10792 17952 bytes
SHA-256: d2ebc000b4e166a83029af378cb5ff95218bdcf6a938a8a49e5d9865d198bff4

Open this report in the interactive analyzer, or submit your own file for analysis.