Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac60e7fc5d9d0848…

MALICIOUS

PDF

118.1 KB Created: 2021-06-25 21:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a6ef220e9a710ce9d1e3c6538496298 SHA-1: 4c8567b4cf51468bfd724e11838ab7a22f25d5c5 SHA-256: ac60e7fc5d9d0848b8eeed4708f2dd7c53fd8b419a188d84081e7bdb08619f3f
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to artificially inflate search engine rankings or distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd0f0870d6---34011062581.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ioq3mtscsng3k1i9v3j7c659q9/nororarozobogox.pdf
    • https://oxi-dental.ro/imagini_ws/83463206811.pdf
    • https://marljivo.hr/userfiles/file/negadobidizizatife.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607d294e33bcc---xapokuzubavunobudulosokej.pdf
    • http://evohome.pl/userfiles/file/65309539806.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609822e2d940b---rureruketimuki.pdf
    • http://berbun.com/user_img/file/45102385516.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/7a680d7d4f668f7cc12bee45920bddd0/wepojebelenufuxivodop.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a61a94ca087---madetebizigudaguk.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb26345d8a---13241709129.pdf
    • http://wskinbody.com/data/boardData/files/6834299549.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/5kjs7b3d1bfuuqf5ql73i9e3th/96129409751.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160cb30412df51---41323582383.pdf
    • https://infiniteprospects.com/FCKeditor/file/44433106587.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/49868231560561d7e442128cc9411b9c/52638091523.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/9a7312401dc79ecd30b2708e215a8fb1/sinefotukujopakigesil.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608afa7495b1c---fuguxovipusilimuvuno.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/h7jidnpm4hqipcaieca89vtq7r/78908334598.pdf
    • http://abc-tel.ru/data/File/65706942985.pdf
    • http://forter.vn/hinhanh/file/99517377461.pdf
    • http://hcvitamin.com/webroot/img/files/4224912849.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=french+words+that+start+with+s
    • 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_off00016b29.bin
16e1f73afbe78e3c654a52b21915e7f031d5be2c839b2744eb650f0b4699d6c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x16B29 18412 bytes
font_01_sfnt_off000199b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x199B2 16792 bytes
font_02_sfnt_off0001b1c9.bin
b13dcffa07d4277fe7b92aaed9deded69230cc375b77ea1eded6bd4f450cc04f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1C9 10484 bytes