Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ac1a1027d3728e…

MALICIOUS

PDF

88.9 KB Created: 2021-07-05 06:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7c25c5100afd03e4a8385f5800705c1f SHA-1: 92efdc4de8d3072e64158076337d7b35d1af8bbb SHA-256: 21ac1a1027d3728e69828dbda11a111bcc2d85ce03ecbcd64967cf25a691da00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links, many of which point to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/5rcga4c5d30mi34ejmud68rmb4/gidosizunuvepofolaseb.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dca654bd8---xibowimagapasok.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075d1e778b7e---debaxunev.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef9093254b---linezibuzudirofaze.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606da787a91c3---51615273277.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/b68912ee3a58e990585faa53a6d973bd/83461080762.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/80011651575.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607062a18d404---25169381839.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/44574973315.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607497e3c1f4e---24199942478.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/82120279857.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/68597501384.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/427950ad3fa1175d2f893e0b71ca7358/libuza.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/7b448748145fc70a9d975059f34bac17/xawek.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ib7tndpfucr5ni45itu2p384ce/dasedixegamawofi.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/b23f4ecc9df0417b45546617c41ced62/60112634501.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/78814514390.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/9ca66adfc5e07aa5d4d4b3c728491adc/ravadufonanigi.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210612_37AECEC8C5DA05E9.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f91b8da6c2---60080933243.pdfIn PDF document text
    • http://com123.vn/uploads/file/lavomifitalegekipa.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/28624791780.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce89152adda---mogamejesazex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+use+the+fill+command+in+minecraft+xboxPDF 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_off0000f17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17F 19744 bytes
SHA-256: 7133606bdd3b6191a699c2e9d2aa254e9194175c056d7252eddca61ac8bbe0d3
font_01_sfnt_off00012454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6B 11160 bytes
SHA-256: 0f4fed880835c6cc7e47c8177d0eb0ce0004ed6c3b990d4c2ecb3375b5eebd1b

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