Malicious PDF — malware analysis report

Static analysis result for SHA-256 15539d30c58a83b3…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 10:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 70559c52b7f1f5d66de8dd6d84cf67a0 SHA-1: b64690686bd60ae01a3496ef0e2b8629963b2ab1 SHA-256: 15539d30c58a83b353cf19507d5b49e27416c72effd1bb1cc88dadde392d046a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mebelihome.ru/upload_picture/18946348023.pdf In PDF document text
    • http://harchovyk.com/userfiles/file/vozijuxogefoxiv.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210729_2334F8A5467F6F18.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/goxudenivopo.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/8133103caa4da5d755498a1d0ace17a0/soverovabatokodudiju.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d42790791a---tuzapewagupizawabuse.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/akad.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bbe903382---guxugalipepubosusaxuwu.pdfIn PDF document text
    • https://bbmint.com/userfiles/file/67139398883.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/cnhl25hio91gco0t5b7oqjgj01/9559133646.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/rilatibepudu.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/timunevawa.pdfIn PDF document text
    • http://svx.su/ffile/file/31996053444.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/750884abf1916b78ab9ab36383847cbc/petokowip.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///kovufixopatup.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/42001008773.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210813220010.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29a06e69e1---67623550982.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/954c50cf8d61a847455064d811126b2b/60596260372.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/upusak.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/nujukujugo.pdfIn PDF document text
    • https://digireg.nz/upload/kodifasabetapolakubiv.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/56369983282.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/56961700630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=let%27s+learn+japanese+basic+1+volume+3+pdfPDF 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_off0000cc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC91 22112 bytes
SHA-256: 97c3d3d878af50ef78a4883ee4dcfcc7b0d89b5c55876f59c473f3a3f036ed0c
font_01_sfnt_off0001054c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054C 11432 bytes
SHA-256: 6d9809da278b24c2062a412edc03da42aa69b91b7dfc69b092930b00e1aa4a4a
font_02_sfnt_off00012030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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