Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f454a25b5740bb…

MALICIOUS

PDF

76.8 KB Created: 2021-06-28 19:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be76d76c41840f4968bedc361231c782 SHA-1: d24d948fbe2d0f9c3594f98899aecf4de0b4ca69 SHA-256: 94f454a25b5740bbe401d2ecec342da48e04576bfc6fa57ea7fbd0c06b529718
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, which are likely used to host phishing pages or distribute further malware. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://chcial.ru/uplcv?utm_term=forevermore+meaning+in+tamil
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7db61ca04d9f8389b1dc4980925c2109/74315569159.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/1of7i6ad3enbrth71lqg7f1p03/lixuxedirigopenakag.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/1411be6f65c5db031a40888c6b2a06d2/16820067604.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b34f840c27---55499598336.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c609fb6d58c---3070075213.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb722401e8---6063996076.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/df715eac35e483ec753327625a345ec4/josededokububago.pdf
    • http://altaprecision.com/userfiles/file/xawurovu.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60c802e58a---61391404948.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160778484d3aac---wejedabexix.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609425ef05e93---84601940467.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16072a6eb3c56d---fijomudutibipu.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bbf5258bb---41159169946.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fc1a00a2e---juteruwadisekuvuzujakuzas.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160ad825f8dbac---42788027259.pdf
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/zoxaturoturezumex.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/spaeensmthsu8n6n8uli8d7n2i/88237342751.pdf
    • https://wodepcb.cn/uploadfiles/files/gilofixapeliro.pdf
    • http://asbufestival.com/uploads/FCK_files/file/92895819770.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ad22dd0c0---79240313704.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28b27960f9---kotozumagifisudi.pdf
    • http://driver-jazda.pl/upload/file/51070487528.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb87.bin
5bcdaaebc33f9f81428006c77ac51e44f278321000903538cb9675a4551d39ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB87 16904 bytes
font_01_sfnt_off0000f6cb.bin
ab1562c6eff008d0306e874588419f058b90fb7fcc93333f6c53e60208fe7955		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CB 10328 bytes
font_02_sfnt_off00010e06.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E06 16792 bytes

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