Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b58eade2212342a…

MALICIOUS

PDF

88.7 KB Created: 2021-07-18 23:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b4ba0e1c698d2472ba8746d0a7dc688 SHA-1: 9d6ccdae586c46eeba039443b3ad558939272c68 SHA-256: 4b58eade2212342a3b0775b6ce97c30ec39164fc1e2b7e6c7d83ac9c9abfd80c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the overall structure and URL analysis strongly suggest a phishing or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://andhimazhai.com/images/files/19074466627.pdf
    • http://msinziniering.com/userfiles/file/kenexu.pdf
    • https://eminencesolutions.in/resources/userfiles/file/87923927698.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/09f362999ed586fa2fd6791c5b75cfd0/wejolifugosijegunala.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ddc31ef7d---34480590925.pdf
    • http://www.asslar.de/downloads/49281184693.pdf
    • http://linhkienhunganh.vn/luutru/files/7680912788.pdf
    • http://augustaelectricalwork.com/editorData/file/jarivenuzuninizetuxirurut.pdf
    • http://centreforeffectivecoaching.com/media/file/98831889763.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/fm8kcf1e1r06vdj8k5oh19id6s/vuzokowu.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160745e8de6366---69256882268.pdf
    • https://ce-mi.pl/uploads/userfiles/files/gowegeno.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f0afdb0a5---45761386930.pdf
    • http://tweddlefoto.com/files_contenidos/upload/files/24361272917.pdf
    • https://facades-et-traditions.com/actualites/file/batozufarekuzujipa.pdf
    • https://bamfieldrental.com/userfiles/file/tuwumiliv.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160750b349c346---xodupi.pdf
    • http://nusamulticentralestari.com/Uploads/userfiles/files/zubitovidut.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f8937a874---21587840741.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2fb90971e5eedc2f2c6595be5fdb25f4/70839078069.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/027d802e4a5131f1a9b9e5502ea7f0b2/47353951719.pdf
    • http://kiuruvedenlukio.fi/tiedostot/file/45212345967.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094aba49b50b---23929248563.pdf
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/41940838318.pdf
    • http://rentbucharest.net/images/userfiles/77170000280.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+change+color+of+text+on+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_off0000f960.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF960 16792 bytes
font_01_sfnt_off00011177.bin
192eda646ca0c1dcc0ec040529a8ad2f971689394e373e828accffb0515d4f25
pdf-font-stream PDF embedded font (sfnt) at offset 0x11177 10820 bytes
font_02_sfnt_off00012a36.bin
ca9eee83c99ca3ec9691be7fa81c5567123ea4db346877f1862a8ffa565387cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A36 16532 bytes