Malicious PDF — malware analysis report

Static analysis result for SHA-256 0538ae8da8f633c6…

MALICIOUS

PDF

87.2 KB Created: 2021-09-04 09:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9dc602c10e639a6ed42250b53e628e64 SHA-1: 5d9d367f6f9fbe48d7a32cca66bad03a3f4e448c SHA-256: 0538ae8da8f633c60dfa7acabbb1e0ff9fb705e769f5586c61f0b481bda8cf82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=christian+barbosa+triade+do+tempo+pdf PDF link annotation
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/60hbegnc5dr694eivfud0aaa76/88395001639.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/b353bbcdeafa496dc5cf9ffe5d7d9764/17638803125.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/fekugalenapuvivu.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/380825417bb65ed783886d26a3dadb7f/baxaxub.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/35541339520.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/33ccc533cbe46650ec893152cbad89cc/22868760952.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/gavaretomomaz.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5dh0g6sts7uqrnso3u5iqkb04a/sifipovuwojoritenedibi.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/wawuwafilones.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607756ea69882---vipuf.pdfIn PDF document text
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/62776769868.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/govesotukatomirulo.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608725a1a95d9---38800811732.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/85347998498.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1608923892849e---jabixija.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c98fda8c515---52820545681.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/61000584937.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/vikosikijoriv.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/91762928251.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/rutog.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/zaroritiletopet.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/7357c6525c83255e70c5b604c5380ef7/lekokoduto.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ba9cef408---remujenapikopodoxugipiwer.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d7d7d7c65---12796758327.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/0b1oba811mhn8h5v2siugtkk7f/rekibofipafixuvu.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_off0000ee91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 18420 bytes
SHA-256: 3ed7276f65047a3502751fd4836d2d54146124ba0a44c5afeca1818cc91f5a21
font_01_sfnt_off00011dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13612 10888 bytes
SHA-256: cd983547e736b27b3dc578de963e7e3abcce2ebe2dcda24823f2c51124db8a8d

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