Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6cbf12e93dcf9e9…

MALICIOUS

PDF

80.9 KB Created: 2021-08-15 19:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c5a70eb1be2d3424f52783188963f90 SHA-1: 3b966ecd72b764c4be2f7887d1068a202834f8ab SHA-256: d6cbf12e93dcf9e96ebb5aa2720a6d8d2da68ef979a3ad6ba7e661df042c4fad
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160abef0ac80d6---12693714510.pdf In PDF document text
    • http://crystaltrade.hu/data/file/semefekudunawebipubazef.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/kubepes.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/tasemulugijuw.pdfIn PDF document text
    • http://idroter.org/userfiles/files/dalirozokinafaxifet.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/b25585b71d87f8cf4c3d6792a77df945/90310549428.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/a932cb5a33cf2995d554e98bd9854247/85979989529.pdfIn PDF document text
    • https://aful.edu.pe/ckfinder/userfiles/files/jakorabes.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d353ce2a3d---kojonijorotabetaf.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee250de4a09---45399404274.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/pubuwunokagixawabul.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/27152498413.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/80946746508.pdfIn PDF document text
    • http://castel.lu/userfiles/files/mitenawunopulikebavose.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b88b2afa54---55027267264.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/vusoxi.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/86839386664.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/tuturitesirasus.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/8b0114f35093fd0498473cb7b1f5069e/xutowu.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/3467463be185d5b79373386be69e70ac/49495488932.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f02879d5f---kiboganopipafavifemali.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/8515151751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pelicula+de+chris+brown+baile+urbano+completaPDF 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_off0000d4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF9 17916 bytes
SHA-256: fbd45c8439142e36e4276a072fc4ccf41cf1ff23ea12f21c1d51a8e1284150a5
font_02_sfnt_off00011a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2C 11108 bytes
SHA-256: cc9e5479e6835b26bf81407f262f13d0c440a837196c0f8d86cf9cb4d7b53339

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