Malicious PDF — malware analysis report

Static analysis result for SHA-256 504e58dd7dcdab5b…

MALICIOUS

PDF

86.5 KB Created: 2021-09-02 00:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c14a934ff70651aba5cc1205a3f857b4 SHA-1: 3416338e8d2344f404dd61321c53b4cbc8aaf9d7 SHA-256: 504e58dd7dcdab5bc2e65d5ff3d7808deca7b65c5e3df995df3b165097ee5702
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware distribution sites. The presence of numerous links on disposable hosting and the use of UTM parameters suggest a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://securitydm.net/slicice/file/98603502624.pdf In PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd6eb34a17---76093020227.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/c4f24810ba6591bf71d55e2e599e5176/19439465270.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/47210319773.pdfIn PDF document text
    • https://network-italia.com/file/79621438114.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082e39b63555---zilerugezigifubavojibik.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/5d7f9c5a1b33990acd3df82a2975f135/fipabivelino.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/kefisuvoda.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/85369290261.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/c078d84d1f875bef2367cfd973c60f26/vureduvexuzozuwebade.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608d10d1c19a4---9808384756.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/8e19cfbfdbaeb13a980567c7ff559913/91706289951.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/er07rrf9nr7mi98q8aoqqjkhku/pudipod.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/lixowep.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/99807154767.pdfIn PDF document text
    • http://elskenecologie.nl/files/xorelajodezesazilazipexe.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/mabarobogolivipadixoforu.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/k6b8osublvu1ednq900saqmo85/10196097111.pdfIn PDF document text
    • http://sgpeo.pl/users//file/tumebeviduvugo.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/wejum.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/96654138574.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/kezatedivokorebowev.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/597e146e102fd9d1e37dd6d30fe88af5/rekunelufusamowo.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087dfa78138a---vexuzevujubuzexonixopi.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/kmob439amegkhgq8sjngtc0u08/61714734505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=greg+laurie+rapturePDF 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_off0000ee54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10666 18464 bytes
SHA-256: 368f48d3dd40e163b3b624760b9f3aa261e00ce16bdbf4413ea757cf924a9b10
font_02_sfnt_off0001358a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358A 10176 bytes
SHA-256: 41fd556874a155ddd19e02759ff3ca8420fb784551ddcc0a16c222da17c9a4c7

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