Malicious PDF — malware analysis report

Static analysis result for SHA-256 505d2e0f40a804c2…

MALICIOUS

PDF

85.1 KB Created: 2021-09-04 17:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8d59ab81d7a3fe93cbeb87ce3bd7cf4f SHA-1: 03e95c4f587050cf7d84feb0f4c016253314c66f SHA-256: 505d2e0f40a804c2373e52ac13369a1ce88895d0041da16b138f8c64fe92f56b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary purpose appears to be redirecting users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8a0953b48---79796726138.pdf In PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/7716707892.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607594a10a0d8---kilagufom.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/kpn1bofrq5pjq66hf6ki2ju9bu/dudusezogiwumon.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/minezis.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/1303572849.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/sijosadewiramejake.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/s4tr27v90h9odeef4or69tm39m/46811392755.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c177d852b7c---lokokusubefakuki.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/49180564526.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/lonelewosowirajofulixuzif.pdfIn PDF document text
    • http://tfforming.ru/d/files/pewoxadidom.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/govebib.pdfIn PDF document text
    • https://norservis.com/files/files/gugigotubidib.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b92e6197709---61379939404.pdfIn PDF document text
    • http://prmakeup.com/Image/files/58660360499.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f2e14631b94---kusosela.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3e5d8a44e---favota.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/33103722687.pdfIn PDF document text
    • https://priscar.com/documents/files/28479006067.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/ca085fb5617d466a27a8c25a1734ebf6/mamisarewusorekadapo.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/bumerifoli.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/61438340947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=chrysler+neon+1997+service+manualPDF 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_off0000e75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75F 10980 bytes
SHA-256: 7cfa10f1fb595346e87b3ac46061c8e1eb35aa4627e3e65c05ad7002dd08be92
font_01_sfnt_off000100d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D5 17644 bytes
SHA-256: 5a86ab4091ee1f5b4d39b92545a06263fe2a534bb56b58a4bab02aecfbac244e
font_02_sfnt_off00012e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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