Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c824ecd4e6618fa…

MALICIOUS

PDF

85.4 KB Created: 2021-08-09 09:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 48765ec1ecd8dc4b3192665068973a90 SHA-1: 71a9617dfd12909f5759df12031e45d16124a522 SHA-256: 7c824ecd4e6618faa8a39b66f852c92546ea3b6006a290212c91a34d81adfc1e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories. The document body is heavily obfuscated, preventing analysis of its direct content, but the overall structure and URL analysis strongly suggest a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0d6c76945---22418077332.pdf In PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160947dba3c62a---fomexawerituboxezepivaje.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/dfgigb22ffiig7hhrs2t4dhfgq/ririfegekilojovemek.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/86251737554.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/gifilagakopit.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/vufexoxugidubimitoxeba.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/wukefuferazezeroxowevun.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160dfe60794582---bipobej.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/wodikotodoxof.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/55515543526.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4cbd023df---83323860774.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608947f91c026---3512721682.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///sijimibugedif.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/1799533230.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5986600b3---20709487092.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a82910822ff---liluverataxakubizuvubet.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/21mmfh7j3ul1gi5t3ubvca4nrl/4150796394.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/81314786905.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/73809cb87d66c1c3b1ce0d76734c286b/fozakosezozesagu.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/l54k86o7fk0t80dtaj2ehp94b0/87988185495.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/1984635149.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/nikenupitopobavuwov.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/punegub.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ic7vcfd389906o0po9b3elu2o4/boragulu.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/6b0b20997d01b63ff6ff7694ead14e5e/93884757725.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/71339150531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=supersonic+tv+codes+for+comcastPDF 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_off0000e925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE925 10976 bytes
SHA-256: b612c6186fa97332c9a64d323b06a9116c245eb3b72f78d37c36daf42a182ac1
font_01_sfnt_off000102a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A2 17208 bytes
SHA-256: 061794bf3d3c633144829e3639660765645015a4c11c1bf2f4c469ede5b220ff
font_02_sfnt_off00012f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1