Malicious PDF — malware analysis report

Static analysis result for SHA-256 db15d9fab1beef95…

MALICIOUS

PDF

102.0 KB Created: 2021-08-01 00:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9ee4357bf09ff202fd13fe5cf3944b10 SHA-1: 6b9392697f817ffcbe04819068de47bddac468ef SHA-256: db15d9fab1beef9501caeb0a1cc74235dc150df911b30e94eb295188c559dd28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classified as phishing and trojan activity. While no scripts were directly extracted, the presence of numerous URLs on compromised hosts implies a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836686bfe9d---xikosuguviwavafidenufapip.pdf In PDF document text
    • http://mawaevents.com/uploads/file/jabixopivafebup.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/60192899602.pdfIn PDF document text
    • https://mmszke.hu/files/file/mukenibavibuzokufi.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/47447632161.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/nesateturog.pdfIn PDF document text
    • https://ladangmimpi2.com/contents//files/babozodozagulurix.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/88fd62bb91e4fb1d7afa231105d84cf6/vusosowaverixalilusu.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/8237993950.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/xilova.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/duzapejor.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3210a6ba1---51317147485.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/gubumexur.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089805f19750---856697967.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/m7r40p3s5vbno4odmmnitqdmro/resuketozuwadokisuzupu.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/auupctdl0ca91p1n9fgi27k7at/17308388564.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c59ba2bdd2a---8046318734.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/81627419926.pdfIn PDF document text
    • https://777mto.info/contents//files/98127691009.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210611110709.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/43419085602.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/77211042838.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd250762b8---mekedoxajilavigabun.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/710000jaufejkegucib24aak62/81743860154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=profit+first+mike+michalowicz+pdf+free+downloadPDF 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_off00012545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D57 18040 bytes
SHA-256: bff30f7623dc819bf5fd8b639c9e9af8deae8de30cc83348f77b0aaf745ef7ae
font_02_sfnt_off00016d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D17 11124 bytes
SHA-256: 38f8ae29d3e3361e489a0130b05fc6fc0062b240393d1d525a7c4ba32627aa67