Malicious PDF — malware analysis report

Static analysis result for SHA-256 593da0a23b3e6e34…

MALICIOUS

PDF

81.9 KB Created: 2021-09-11 22:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fb0aa021cc2ed17c462cbc2cd368c578 SHA-1: ad644a78f15ef9f4b464d346f30781a2b7659fa0 SHA-256: 593da0a23b3e6e349babfee6da4167c7944f24522029a8f6e5c7c2b1a2fe5ecb
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, suggesting an attempt to trick the user into downloading a payload. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions for accessing a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613251957266a---vemirifud.pdf In PDF document text
    • http://resetimpianti.it/reset/public/file/50216492295.pdfIn PDF document text
    • https://nexapos.com/upload/files/5876250344.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/70586273002.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/xovibosoxogevunegiro.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/23931029976.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/82947589672.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/39080741863.pdfIn PDF document text
    • http://ping-property.com/user_img/files/wirixubeleli.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/f73f71c2011db8427f1f25b7391b26e3/nipumumifojemav.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/84894587441.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/59653531601.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/74637248818.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/wazolosujude.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/pigudawen.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/vixaxuzanidov.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/14358622253.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f38991cd---moxuketinexub.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/luxugibimewasesob.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/zufodamelilonene.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/damufavatememosed.pdfIn PDF document text
    • http://selidbe-beograd.info/files/49945886499.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/56351789720.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/korudagalifarojedituru.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/31372391742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=come+aprire+file+txt+con+androidPDF 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_off0000d79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79A 10744 bytes
SHA-256: c8a2d1f65c5b6a75ca2d811f709704293791f4afa1dea7c6af423beb179123da
font_01_sfnt_off0000f047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF047 18508 bytes
SHA-256: 2ad2d094d9a170a0b4bb1e754ec92f0f03045b2115ab42af8fa7619efbdd5de3
font_02_sfnt_off0001207f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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