Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3fda421c9fe7c8…

MALICIOUS

PDF

79.1 KB Created: 2021-10-11 06:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: de677a893686ab24c167e2b6c5fe1907 SHA-1: 3f0a3ead21db3b8ba28e0939037c6a82c795da15 SHA-256: 5b3fda421c9fe7c87422d7766c54f88daf073c6362901edca5cf7a2d4b7bf93a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive, which is often password-protected to bypass gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://keitbg.com/images/files/11971782282.pdf In PDF document text
    • http://w3-japan.com/js/upload/files/rogedamidirurifetewanidu.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/52240636459.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/25167007920.pdfIn PDF document text
    • https://borsalino.ro/imagini_ws/56679302600.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/xutivugekobe.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161503d069c11f---farukajawafisufofunukat.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/gupuborukexijufufiruwa.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/fb9534b1212bfc467319f890684b0f2f/18860453861.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/dulipik.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/poluvew.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/lusofapawobirabanibowu.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/43065181847.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/rikisawapodideduxasexo.pdfIn PDF document text
    • https://guijek.com/userfiles/file/59483440080.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/53915521400.pdfIn PDF document text
    • http://penzion.sarmo.cz/Images/file/23899541783.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/554a620416315a035f80cdae1d3d2e1f/defiror.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/67471602998.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/29738585338.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/mojesobojarunenixezis.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/morewanawobotizovu.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/60338614576.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/63773049489.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/74e70e8b26ec05e5a0a6861144720431/351302555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pmay+online+formPDF 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_off0000d425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD425 10224 bytes
SHA-256: aa7c2df943c2f3b0e1d7f8643154ea80b755c6afd1997527504656c929b72f18
font_01_sfnt_off0000eb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10317 17156 bytes
SHA-256: 07dd83062abe19ff6c560a4431373ed5c877697b6a273beca7eeb2dfdd3d1a2b

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