Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b87f691d8f5562…

MALICIOUS

PDF

81.9 KB Created: 2021-09-10 16:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 55afa5d00d3afe9c7a19d0aabc51a08a SHA-1: 01da2d20812bfa31a896bbc5960ab8014b285601 SHA-256: f8b87f691d8f556296c435bf9e6f73e93b633cb095c6a2b67d48cd131aebbdaf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of embedded JavaScript indicates an attempt to execute code, likely to facilitate further compromise or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://siliconautomation.com/userfiles/file/54531253101.pdf In PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/74a4c84fbf7ffe029837e0100eebf249/76101754158.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/mawogabuwip.pdfIn PDF document text
    • https://scalper.ir/data/files/file/tasiwuliwedinezixu.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/kogeromafufitaje.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/24579361044.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/6e5f54101bfc4c437a14fc9cdbb2488d/91227698619.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/jogepapawuninija.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/26688140076.pdfIn PDF document text
    • http://cobmedia.hu/include/83261717512.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/juwepimusovitagozomupaw.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/ed93953919325e8e22502716d12548df/niputojerevujazometovu.pdfIn PDF document text
    • http://btfa.tw/upload/files/48997924571.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/33068539234.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/89304915068.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/momidid.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/papejijujeratuk.pdfIn PDF document text
    • https://promise-land.com/upload/file/68925585374.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/vupapejitejesajabez.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/92841699586.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/5776746704.pdfIn PDF document text
    • https://aneri12.eu/res/file/zawowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=bodyguard+2018+watch+onlinePDF 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_off0000d905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD905 18052 bytes
SHA-256: 4f3f80a5ce237034634dc000638fed621073c584455b1b56ee868d6d5c14d4c9
font_01_sfnt_off00010753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6A 11336 bytes
SHA-256: 36ef19f42a9aed59f693debfaf4f09544a0103a544d82a019a3f26d08d73b74c