Malicious PDF — malware analysis report

Static analysis result for SHA-256 e15324a87a630c82…

MALICIOUS

PDF

92.2 KB Created: 2021-09-23 16:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2c1d7e6a4d6c4205033c783bf57d22f SHA-1: fd64c11b434fad7a722a6f3cab8dc7a2ce6679dd SHA-256: e15324a87a630c8286a2ca84940526dfb70e3367cdb68f704cce7a2c3928f7f7
196 Risk Score

Malware Insights

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

The file is identified as malicious by a ML classifier and ClamAV, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs, some pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of 'cmddqb05hjmv5c0efvd5/zopijefizodurujimamu.pdf' within the document text further supports the malicious intent by referencing a potentially malicious file path.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://philabc.ru/uplcv?utm_term=melhor+site+para+jogos+android PDF link annotation
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/3474510406.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/sogalemubamo.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d299603ad5---40825802172.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/43399475954.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/lar1vhcmddqb05hjmv5c0efvd5/zopijefizodurujimamu.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/zenopez.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/34082001126.pdfIn macro / runtime command snippet
    • http://badgerhillfarm.uk/genexoke.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f356f71f5f---daralir.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/27942347266.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/38712158950.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/64456749283.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/femofunotilapufiti.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/tobodinoxigalixemova.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/kotawikupimavekimojujip.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/silobijokeba.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/36911530364.pdfIn PDF document text
    • https://tessuno.com/upload/files/6144010177495.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140d6dc9c915---govupopipopo.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/xukave.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/vozosemazisodinil.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021911316447484.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/40408447673.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210908_E8691F308BED192C.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/18075901442.pdfIn PDF document text
    • 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_off00010033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 10792 bytes
SHA-256: ce80b878d4e5d24a64382260328026b20956d36c3f876b7c488b9d51100f02b4
font_01_sfnt_off000118c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D5 20116 bytes
SHA-256: c189fc517dcadddd712e0f3e98fd160ac533c759e8e4ba102c1d0c8ce9803af3

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