Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7edfbe9c1e7df46…

MALICIOUS

PDF

78.5 KB Created: 2021-07-20 02:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 103aa49ab238e535a51ae98a4ff0f3a2 SHA-1: 8704580043655d1ff619357018e1fb6e6d195206 SHA-256: d7edfbe9c1e7df4602b6eea72c2aca2624fa1470e7f002d7d2424f232cde014c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple unknown URLs hosted on potentially compromised or disposable domains. The document body is heavily obfuscated and contains no readable content, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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 http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6022e337a1---31040291190.pdf In PDF document text
    • http://agcslohian.com/userfiles/file/88262868705.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/1997921873.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/o6n64g3bk80n26q3emeg4mscv2/somabixivisidole.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/08/xumasuleguviti.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/68700762322.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/bosojaxa.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160906e7d1e092---ropunizi.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ced5e6caa---kiretipijesibi.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ktooj1fidko6n80go6prr64shv/38026254614.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210619183639.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/dokafu.pdfIn PDF document text
    • https://vieclamkinhdoanh247.com/upload/files/jatisizivonixuxap.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af347dc6ae5---nefit.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/57655079320.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/xuwopabovotujapilet.pdfIn PDF document text
    • https://85097781.com/upload/files/timon.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210608014901.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c79e5f393---nesejupudetonudiposewelo.pdfIn PDF document text
    • http://fundraisingwebsites.com/clients/9/96/963d931f30a9d2280975e71a7f923c96/File/nuwupimufumo.pdfIn PDF document text
    • http://summithighschool1958.com/clients/71652/File/60847140420.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/64098697472.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/mcm32praf3fsrkdoo4niugsk23/wusaxegeba.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/ca44f4cae6458211df234fe646130ac4/86225685354.pdfIn PDF document text
    • http://unseretochter.ch/images/file/85829883934.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bced6ee90d9---79446267171.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a43f65db2f---xixepenusegefa.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f6024a38c9e---varanufid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=best+bible+names+and+meaningsPDF 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_off0000d0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C8 10564 bytes
SHA-256: b65486b3bff55ae9d8897e2f1e5dcf8796c0afb0cb561c05b65424e4e74e6550
font_01_sfnt_off0000e8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A4 17064 bytes
SHA-256: c18eeb806793467921b8bcd7a332b19ec4813c8096212cf7de09706d455b9b31
font_02_sfnt_off0001141b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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