Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad134506db5c4cb9…

MALICIOUS

PDF

85.6 KB Created: 2021-08-20 18:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2d30bf72ea04cc7a99f15543f224cf13 SHA-1: d610d9e765dab69fce49d157f94132b864bc1bd8 SHA-256: ad134506db5c4cb93532b6ae61426f7542f1989f2d3a46637b9dc222ef503f2c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristic analysis revealed it functions as a link farm, with numerous URLs pointing to compromised CMS upload storage and disposable hosting. These links are likely intended to lure users into clicking, potentially leading to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d883d5f38e7---zolakoja.pdf In PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/084890b64a6dd6e9b473cc3fa3a30ccf/46247218715.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/86846361164.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/97595845336.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kagudomixugebidex.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/fulaxederavarirukarunobo.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/walogelumisi.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wekevelaxojemolikori.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/5c04c1a566441463d98159fddf7c4337/43301866238.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/88236963697.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6b73c0c5e---19477176224.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1c7690f0e---dasifogakadetariseduv.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee31c5ee111---99893002510.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/5868221227.pdfIn PDF document text
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/22067265259.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/72569839028.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/31610678570.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c41be3d9902---bovukajemir.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/57876737532.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05f8a9d301---kusaxuvev.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/78121211739.pdfIn PDF document text
    • http://capital96.com/userfiles/file/javazur.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/65305408987.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e1c72ad67---muwuf.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/8255067627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=warframe+how+to+get+archwingPDF 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_off0000ea61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA61 16856 bytes
SHA-256: 836b8e93cc2907f57ccdd5d778366fd6091a5955d9096e2d1ee7c5f8cbd0551b
font_01_sfnt_off000115d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D5 10648 bytes
SHA-256: 2f3d1df75ef979762fbcc6114e2d232a49efe236be8ef2d16377a956211f131e
font_02_sfnt_off00012e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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