Malicious PDF — malware analysis report

Static analysis result for SHA-256 13113e64d550a50e…

MALICIOUS

PDF

150.7 KB Created: 2021-06-24 07:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: ed644fe734c05c25398da96605dad73d SHA-1: 94acd265eb840ac79cface356f72c11d8717b80f SHA-256: 13113e64d550a50e562b72c8dba0a6c74cb0b23c74dfb0da4f6d4c17ed93c195
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ee5a68565---namutumewajomalefej.pdf In PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/e4db482a896991d31cdcaa1472697e6f/71886478036.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/lf7jmp07uo141d3396d6m7fiqt/lukulurimuf.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/04930cbfb09ca6bd0976c1c34d396611/57841848566.pdfIn PDF document text
    • http://garderoba.sk/images/_file/ladexiremulibavet.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/df1e22ef9c7bee5733c5b6ce69a9965f/wagemefawosen.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/f93ccb71296fbbc2b1b19d5b1211000f/79157185279.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b252ddc173---wamenamimatudefumenos.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/18229a47b74607944326dcf52730cd3a/57297506951.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/j60445l5kf4u77k9qq0eljp4u0/bifurilajomosuxewadom.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/0762512df9f00094ebbe7f0650988a10/58004568475.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094834ad02e4---42138841964.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982bf15eda0---munozugefopezazikov.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/25367723545.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd9b682be---98036493300.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/12132907572.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/8ma28f2fqmjf6rmi0sqqbqldm2/sovukiriwepizo.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/41c053ecd7a4ccb5996be85377fdec41/47314993674.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a1bdd1102---87428567992.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941daa9d6f3---levumolulibap.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=balbharti+kavita+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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0002020a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2020A 25524 bytes
SHA-256: 21bfc870b4c79c99309d9a7e06b22d7218399010387760e09ed5ebeb7c55e846
font_00_sfnt_off0001bea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEA7 5264 bytes
SHA-256: 8205469e1f0f5cf49f005511d6e33dacb6c9fbdd92194cde7d1f63d767bf6963
font_01_sfnt_off0001d084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D084 3720 bytes
SHA-256: 40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b
font_02_sfnt_off0001dbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBE6 11076 bytes
SHA-256: 25475e1a6f8a46a7305df481dea19704e6b065f616c60f81befc8d0fa1b38d84