Malicious PDF — malware analysis report

Static analysis result for SHA-256 f278b3b2bd55fb90…

MALICIOUS

PDF

79.4 KB Created: 2021-09-10 08:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4af5a5b65572a50837f289fbb3c99f14 SHA-1: 9493739acd72718d7854dbdcb2ddf9d07be9c9d1 SHA-256: f278b3b2bd55fb90be4dc5df8c1fd3850801bfd66563c3ab88d8bfaa1d1a70eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the link farm and the ML classifier output indicate a high likelihood of phishing or malware distribution.

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 http://worthingtonpark101.com/userimages/33069277422.pdf In PDF document text
    • http://queenart.kr/userData/board/file/58006350872.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/64181906158.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16132dddbaa711---48612819744.pdfIn PDF document text
    • https://greenways.at/userfiles/file/35168355269.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/32090598780.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/39247390364.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388f66c7511---matalutemikikuw.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/19417284526.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/1810203959.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/zejise.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/budopezonerusozorerukeja.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/75043906480.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/gatiwojinu.pdfIn PDF document text
    • http://partnercable.hu/files/zububix.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/duxufibuvelibotodasi.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/70879942313.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/00adba46d625099e52f3efeb419435fa/92897017363.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/84402230605.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/91112861939.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/83025649208.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/47851921527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+access+usb+on+android+phonePDF 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_off0000d22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3F 17276 bytes
SHA-256: 2ebf1e23fc6a9f68b8c743a898dbe8ab6f7e646dabda8ba7750b7fe22f009540
font_02_sfnt_off00011725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11725 10884 bytes
SHA-256: 06b3485ae1608de2c04a5ba555f06a9eb8fece884ece1ed0a73b605207187212