Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5ede9209863d5a…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 03:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 38000e022c86565d061ae7ae84a07b03 SHA-1: 59bbab04a8b72942567b52566b98757d800ad96c SHA-256: 3f5ede9209863d5a020ea991114bdf4cc9e95b27cd74bef7a4b5cdbcafddfd19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the detection as a trojan indicate a high likelihood of malicious intent, possibly involving the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crysiq.ru/uplcv?utm_term=what+happens+if+i+encrypt+my+sd+card PDF link annotation
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/3c1a6790feb7226708df91c5d593f900/dixoxu.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/nesonitesopa.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f506b461d1---lovuvejarujez.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/moremoriwalaje.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/tozawupedarobor.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/88357524573.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab7a208d3---52120735741.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/174b3cdeb5bcf20573f7ec1b28df2f8f/fawurot.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/46823701856.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/77335852451.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/xulunag.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b6dc1b262---gekep.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/3885930118.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143b5f8e64c4---kitikipilivopoderiliwij.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/xetaxolasojaxafapize.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/25912752945.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/kejolebugudibuxunewamewax.pdfIn PDF document text
    • http://origo.ws/userfiles/file/69501250879.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/33896804365.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/70847613101.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/zomexasazixof.pdfIn PDF document text
    • https://halead.com/uploadfile/1631688994.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/6590072663.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16139522c3f572---girabowotaketus.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/32291844167.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210913014416_cm5kib.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_off0000e375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB87 17916 bytes
SHA-256: 8d58673c3d10fd499fba49fd9e8178889a7d899e54b5f25b54f1a9f70e71326b
font_02_sfnt_off00012944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12944 10824 bytes
SHA-256: 03a8a3d80fb95939944e480aece5a27970df0db8bf7ecd18fde092916713cb2a

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