Malicious PDF — malware analysis report

Static analysis result for SHA-256 4107b18c05c02b58…

MALICIOUS

PDF

113.3 KB Created: 2021-09-03 21:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 77dc9aba6a7583a5a44be62e595c6b9a SHA-1: a4f95c538494762b8aa71caf17069ff42af41e7b SHA-256: 4107b18c05c02b58eaaaa6dc88784ce5112adb402c5b5ef4be00a22f457a4bfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS upload directories or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the document is intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/861dabeb40c357dd90c39a617ea05b7f/43563787119.pdf In PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/zubime.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a32a2828f81---pinobobabuzojaxis.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a236bca3bd---kivid.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/biwasebemititi.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/redomumepoxoxapemafiwudup.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a151170d8bf---87608186289.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/59716610466.pdfIn PDF document text
    • http://adveotec.com/img/file/41590575518.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/63132951619.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/tixefijugisosujiju.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/67442963668.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/87371567578.pdfIn PDF document text
    • https://kartplast.com/resimler/files/51479231280.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/96017917576.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/87fvi9hl4v8gh8466jsoav90c4/43064077794.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/e9957f90c5c47afffe7c541563a1d8da/sorerojimadosuvi.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082931c817ca---doxatapogur.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160afe1ac4c29c---23388862166.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/99023184676.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/sugipiki.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160876e2dd475e---19690529418.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/01hcs3gdt0ao9bes6ightv5n1i/75926474542.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/eed636d813152a03d7d1fde6f8019959/polobogifopusugujonokamob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=tipos+de+energia+renovable+y+no+renovable+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_off00015085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001689c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1689C 10860 bytes
SHA-256: 15b1034535521248780de9a3c92da01d82e1fc5741c16ac884748a648bfe5fff
font_02_sfnt_off00018165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18165 21352 bytes
SHA-256: 0a00f5aacae73ed3bd15e4666bc15460983bda43df8d9a1345a0cbfd1e8e063b