Malicious PDF — malware analysis report

Static analysis result for SHA-256 512f6f1fb4853932…

MALICIOUS

PDF

154.7 KB Created: 2021-06-30 10:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 35a1264d0714ee8d7ab26e0d7b1b61b7 SHA-1: c950fe7b5b886e4e11c47da280e737ceebf0201d SHA-256: 512f6f1fb48539320d2b1234521f44a2999174b9da7cd93edf42263fbc13f4df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure suggests it may leverage embedded JavaScript for redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

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 http://monkey-do.net/userfiles/file/51577573148.pdf In PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/f20b02c63e6df053cbd99559f0d20e7e/fejadegipijebopebiduf.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855862a7285---33378959505.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/18685809623.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078bec3110b9---34920057660.pdfIn PDF document text
    • http://teplospectr.ru/images/files/fagevoraboxizu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160873969cec48---10359751218.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/63220206970.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97cd32c61b---48460342177.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/28809278668.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/lumefoxox.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/38708395838.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/goraw.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/katadafogaxeroxeresijado.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/88a6533ebea2585cbc5ef8228a47c059/21563152478.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/jigiguda.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/31795483321.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/fudevapuro.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/23597482715.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/koseluvamiwatavowegeg.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ed3a7fa29017b742bef359430c6e9726/gekutido.pdfIn PDF document text
    • https://filetorme.com/upload/files/61611595209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=tom+and+jerry+kitty+foiledPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001dea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEA6 20360 bytes
SHA-256: c24f3f80e18e4abdd4acf2d124c58992ee404f31d629659c565889aef88c2262
font_01_sfnt_off000211b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x211B3 10644 bytes
SHA-256: 1dbb930cfdc1c8f0192188a9d8b53cd6690a362d6ca627b7b628c879c7ec5904
font_02_sfnt_off00022a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22A07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00024218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24218 17112 bytes
SHA-256: 885b9024a80bd539ee88f4c17c1e1fa3cc6dab475ff5b740ebf17c73a317c9ed

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