Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da0c2dcb5e1e71a…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 14:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c8fc90c324c81d496f5cf5690e6c4037 SHA-1: 4ada71366452a2338e1e1f82634acd4054abf96e SHA-256: 3da0c2dcb5e1e71a9ce21106e782f9743c6941e23828f5e79ce344d54a81ed06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristics and URLs confirm the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ecd3ca90e---3802973195.pdf In PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4da6a7725---84695667821.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/193d9d03bed6d00c64f6c6bff3f5e600/3876502934.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f95bc9a36---20772073561.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bea3fb816d3---zomapobuxolinix.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/nebabemukukopividameju.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/40835004315.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/dudunemuledakofan.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/43088951722.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/93255037058.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/c7imf2hncr7f0vkh91qtk7j0hd/3424076579.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/kakid.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/tco3io03a7csurou44gu48ugbs/3167201508.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0814864ff9---63596886676.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/d431b0fd0f9a5c798dcd8a2b5ba2b220/meretajojitejine.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/86962071840.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/29807818749.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/kozokedabunagebi.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/91340467887.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/17664667817.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/4ca156c2511c01db7e059e97ca78af52/25171924944.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7uih41kv2c6uu48hq7h0sf5hc6/xogoguxojuwusosufi.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d863df566---peluxadetibozorugelox.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a57254bf1a2---futoz.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e82f59ff3c---29682458420.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/a99rmi2mo6tkg7l3umh8pgjd32/zinokegelo.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16097df5ab31e8---19331910912.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/nukarexafujubaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=finding+area+of+multiple+rectangles+worksheetsPDF 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_off0000dd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF518 11324 bytes
SHA-256: d500155ce28841e26d1ef16da19a04b2181909bee00deba7d5a899490b1c121f
font_02_sfnt_off00010f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5C 18608 bytes
SHA-256: 90b0df4882412ef266ceeeacd6a31d7c9d191291fe6999e28d1a704b1f91e7eb