Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dfedd9dbda1c719…

MALICIOUS

PDF

75.4 KB Created: 2021-09-06 15:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3b546428e44ed17a9f81761458079288 SHA-1: a1da8239c193ccd6cc4333fdf62c48b3bcc7106a SHA-256: 3dfedd9dbda1c719b03aa2d4f06a5d28f5a23ef0e3552c2ec5df0f32fdb897da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect the user to phishing pages or download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://catamma.ru/uplcv?utm_term=looping+in+programming+pdf PDF link annotation
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2a72eaf20---63569832823.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861734ecbda---malumewezuwaboredeza.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0d4a1e70b---33378308369.pdfIn PDF document text
    • http://bakoca.hu/files/file/lanotalozu.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/8973833805.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/gizamowogasex.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/81462682419.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbd14a49c2---kuxoxereditiv.pdfIn PDF document text
    • http://metallpress.info/files/49989583524.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/0q4ruse9j5ppth2a5b5kqsjmj3/jaxemonujumo.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/82455633822.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/52160947099.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fad8852bf1c---57499196069.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/redifemeloviliguwosagura.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/86593203150.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/77bf7dc68997d22eae5b707914e688c3/zibegenozewawumo.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/vudemofivapuvu.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/fujiduwotavu.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/154661bfb7becbf760def75b3ea82c31/telujedisosijodawazuv.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/17642324745.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/xizazuzaneforufoxen.pdfIn PDF document text
    • http://nrnchina.com/test/images/ckfinder/files/65173034021.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/k887te6drmtm2mt26oele3bup1/tuxarik.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/26623052116.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_off0000c486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC486 17172 bytes
SHA-256: f24587d645effb07123e81d0748b922b6cca84d9c3ea9f997d243c4dc6c4e88d
font_01_sfnt_off0000f169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF169 10352 bytes
SHA-256: fb393b07788e66e40778618de13c0ecefaaad896cb39d1e3d9269297e2431088
font_02_sfnt_off00010879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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