Malicious PDF — malware analysis report

Static analysis result for SHA-256 5730b6e9fe90edf6…

MALICIOUS

PDF

88.2 KB Created: 2021-08-01 07:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22118244ffba84b22ee4cf6f2ef6a65f SHA-1: 5c9b1b8ea87d984842a0c9ecff9fc71816a5e87a SHA-256: 5730b6e9fe90edf6e0962ab5c64cd5c853ea2d0338ac68f7d1f8f4fbf7bc1ab5
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, pointing to multiple compromised WordPress sites and disposable hosting, likely to distribute further malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is designed to trick users into interacting with these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963748d02ff---pobetelajipedepiv.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f15ed22568---4843955716.pdf
    • http://altelaw.com/uploads/image/file/bimawofa.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/f3b5fb9901dda67e924a48b85be94446/79863249999.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d228d0250---95129567182.pdf
    • https://ocw.tw/uploads/files/selalumifirusetitow.pdf
    • http://prttour.ca/FileData/ckfinder/files/20210612_483BBAAD065B5B4E.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/9a95opr9n9gj36o3g3qtsmc9a6/pidaxivotipe.pdf
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/23cd3631196ad8d6dfeb13b686f5ad79/dibevigotixuragexitewi.pdf
    • http://china-zzld.com/uploadfile/file///2021062609302155.pdf
    • http://anaminfo.com/attachfile/file/68888041176.pdf
    • http://thietbiotovn.com/Images_upload/files/wipofe.pdf
    • https://nepalipublisher.com/ckfinder/userfiles/files/savape.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/26945759800.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/fa7091c7f55f77c9bea3f7839d1c1d04/60732176329.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/3nk8raevgola5hu53c9dd2ios3/dufilu.pdf
    • http://benetworkingpro.com/ckfinder/userfiles/files/32793232274.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/dfb2d610897c16487d985676247600aa/84968446439.pdf
    • http://csc-0411.com/userfiles/file/20210726025914_wx27es.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/d07455ded8e772fcce0544830a408e1c/vetadepepin.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726cd263e76---67181152501.pdf
    • http://adveotec.com/img/file/pimeviwewad.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b300c91050---wedexosezosuvoba.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+apply+for+an+illinois+link+card
    • 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_off0000f2aa.bin
a5579c08530070090b07564f80eb39fafa325b6ba8bd733e65fb9f8231ad60a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AA 17648 bytes
font_01_sfnt_off00012133.bin
1f93aee1491bd1c74a9a3a344ab785a52e032aee4a33c7aa9be219b83ca48577
pdf-font-stream PDF embedded font (sfnt) at offset 0x12133 10764 bytes
font_02_sfnt_off00013a20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A20 16792 bytes