Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9dee7f3901b255…

MALICIOUS

PDF

84.5 KB Created: 2021-08-16 00:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 28f16e8d1ce52663cec6510c76ad2ed7 SHA-1: 586028b3670ed92be551c35662946b10bbd512af SHA-256: 4f9dee7f3901b25509693d9b450ca9fa949c1c94bcaf332c6d455f31d41977ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other potentially malicious PDF files. The presence of these links suggests an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/2d2ddd69f340a344f9a9b8608b035830/tazuviguwoda.pdf In PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-22/20210522130810696653.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/71823045221.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3f42fa50---misolovugu.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dc1ed3db2---74637699693.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/97754983476.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2df95c62eb---lezevukojefonur.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/20e7224ef34cf48367061a737b157bba/vexaluzitetuxolunapur.pdfIn PDF document text
    • https://yasacompany.com/upload/files/83235163373.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/62599737889.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/15012681295.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/tapolapipuzirizujiraxu.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2695341489---37151295264.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/6118217570.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9c2deae6---dowidi.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/golexesolezogisun.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/72794159159.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/2943392127.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/vejuxuxudavabojakikekes.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/34883146752.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/54022149939.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7b443aa9f---94022205989.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef907aa5c---jukinovok.pdfIn PDF document text
    • http://southfieldhigh.com/clients/a/a2/a202dccd336a30abee2d0a4364b9f07c/File/86197574520.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f2c1e7ddc---30373315352.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/jojukomesete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=do+you+get+free+xbox+live+when+you+make+a+new+accountPDF 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_off0000e2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 17288 bytes
SHA-256: 0d0470bb42999399c6df46d6ef9eb4fb6f56860348097c86d35cba924294ba00
font_01_sfnt_off00011027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11027 11316 bytes
SHA-256: 595ecaa2a1d1b692d2d3bdf011aa322abe7fe46ba28531df79fad1dd206c02f4
font_02_sfnt_off00012aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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