Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e15808df3e37764…

MALICIOUS

PDF

87.3 KB Created: 2021-09-01 07:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78596e91c95bf5ca8e2fcfc8bd4150b9 SHA-1: cffb1cb57020a24e819ec950fa1b621bb3b9bab7 SHA-256: 8e15808df3e3776416b2195ecabbd307cd6f0ddfb76e07b27c69f66a8384ba25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pixomot.ru/uplcv?utm_term=what+do+you+need+to+make+a+sawmill+in+terraria
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/k692nbhsgh72gosp1lc9ktfjf1/45587472761.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c2958adcd---sefuwazukadudaribenivuz.pdf
    • http://szentimresiklos.hu/upload/file/kazutejumud.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/97159c3b6e87b1b935a11633dd7e1cdf/bezumadowusizemuremili.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d38e6184b---2685021257.pdf
    • https://marljivo.hr/UserFiles/files/36367519107.pdf
    • https://bhsbeacon.com/FCKeditor/file/gikekurusupewajavijon.pdf
    • https://walkandsmile.com/userfiles/file/21786255924.pdf
    • http://fishtech.org/uploads/userfiles/file/file/26174131202.pdf
    • https://mayxaydungthienlong.com/uploads/files/files/mepibilavusevererox.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d323529ba2---51373906673.pdf
    • https://stallion-international.com/userfiles/file/69043392621.pdf
    • http://hyundai-dongdo.vn/images/files/79487826492.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607b89b9d49df---jukofatulamepafodak.pdf
    • http://autosoftware.company/autoresponders_images/files/sojuni.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/m3904vgn27e57pve4vgi3thke3/wapoviw.pdf
    • https://doitoutdoorz.com/file/mrI6peWJPKWWF90v.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092c9f8d1886---xevud.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/88f3247fa2c192279e91da0b1657f7e9/rofoxuwuxuzutidolokusulow.pdf
    • http://daphongthuyhueminh.com/uploads/image/files/ritupipixufaxejebilal.pdf
    • http://taxicityplus.ru/userfiles/file/zonanokuzogujidowigere.pdf
    • https://ecodiagnost.com/ckfinder/userfiles/files/sozad.pdf
    • http://www.chubsorn.com/file/files/73611057275.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/9537b92c2ba6838fd9d8e59634b04ea2/jufibej.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/betitikojaw.pdf
    • http://alcantara.cz/data/file/sorasamuxabuwas.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_off0000e8f1.bin
a030ff6b9ab71ba183b54715a20403eb3849db7ac815103db1ae6f5721f543de
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F1 20116 bytes
font_01_sfnt_off00011d9e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9E 16792 bytes
font_02_sfnt_off000135b5.bin
081dfedd16ac3ccbaf72894a61f99a17384e1f80ac92aa341d892cbfdbfa37ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x135B5 10896 bytes