Malicious PDF — malware analysis report

Static analysis result for SHA-256 55243dcd751d7ca5…

MALICIOUS

PDF

82.3 KB Created: 2021-09-22 09:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: c1524ef3128a216b0a866ee92891881b SHA-1: 5d3cc54785e0f57fe4006b826b009fc79db749c5 SHA-256: 55243dcd751d7ca5f8289fc8481207ca61d611402c8cea36ee82520737f93d2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to facilitate initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://dsverano.com/UserFiles/File/51185304760.pdf In PDF document text
    • http://evaemlak.com/userfiles/file///35627102045.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/mivimuxubasomiwuso.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/wopokapi.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613febfcce8b8---24885138175.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/39416819933.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374070dc764---devage.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d47501d0f---kajaki.pdfIn PDF document text
    • http://nemochem.cn/upload/files/pununiwok.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/58445483478.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/xided.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/taredijuxerupevivarobufo.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/gupugeno.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/gatelusilamunu.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/28158915107.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210916154707_amVrb3ZvZ2V6ZXBlcnV6dWp1YnVyaXJ1.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/pasasavozafarusape.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/26161028493.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/46324982832.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/1720e257aff0cb2aa0f5ea47861692c2/pigebizirajorajozibofu.pdfIn PDF document text
    • https://asken.as/bilder/file/xebakukejinoxukeluvate.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/jadabibibokitogozuwoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=protector+de+pantalla+en+movimiento+para+androidPDF 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_off0000d9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F7 10576 bytes
SHA-256: 9c85926bb9fca7342ce42f2a54b9eedb0e8eded2e4296c24e919fa458b7edb5e
font_01_sfnt_off0000f213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A25 18928 bytes
SHA-256: 2b6f6706f8547df8924bed0847bec5eca9dc9713934b79148c120975366ebb5c

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