Malicious PDF — malware analysis report

Static analysis result for SHA-256 658daf8d2df536d0…

MALICIOUS

PDF

83.0 KB Created: 2021-09-11 17:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7d2a53e7832b0e2870d0896740062314 SHA-1: b57c209ef116fec4123cb3def0ee20bed07deb39 SHA-256: 658daf8d2df536d0d471e3a94b7ca20aea4ea75e23fb157411b531e99f11d670
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/fg21fu9r3ac1ltc5i7t9ea3217/97131779704.pdf In PDF document text
    • http://ouhkpthaa.org/userfiles/mafowemukurokofozod.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/sufowaxetujedufen.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/pajepadixolazofiwejixupip.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/1011702503.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370f0194429---norisoderovulubojofe.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/34742584910.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/lunaviwebosubivase.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/85645298010.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/lubopefimataxewinibexada.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/55234780078.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161368dfe9944f---jukifiwuz.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/f5b4010ca40b6673307d47c5f77c78ee/povepa.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/gopujalalomozigejinazuw.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/gegaboxedibasefelutep.pdfIn PDF document text
    • https://slotpt2.com/contents/files/risajisodekubogegulut.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/95450029410.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/10941717667.pdfIn PDF document text
    • http://i-dron.cz/data/file/24519164632.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/tobafekugozurazefavirafak.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/93641995387.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/dofidos.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/gufuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=zack+snyder+justice+league+movie+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_off0000da6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27D 19268 bytes
SHA-256: 8f372c777ede575daeed34604934cfc4ec691d0104a7ec8c0d4f9940efb715ab
font_02_sfnt_off00012477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12477 11176 bytes
SHA-256: 6f038e74aa4e9d4def87c3b6b4a106c8ee68622424ded1a5fe6ce392edd9e2f0

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