Malicious PDF — malware analysis report

Static analysis result for SHA-256 6259fbfc5d0fa9ce…

MALICIOUS

PDF

76.5 KB Created: 2021-05-30 09:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: db2e6dfb879b923e88551323c75de6f1 SHA-1: d218689ac8397cf4d431f977ac06ac39e0d1f555 SHA-256: 6259fbfc5d0fa9cee2faf804b0842e1ba0cb8ea5c8b4d6a931ece6d560e8bdb5
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 0.9996

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://allytemp.ru/uplcv?utm_term=gktoday+pdf+free+download+in+hindi PDF link annotation
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943a48c4948---doluxefebodad.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/82634243533.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/4a0f7fdc9616814a7ad9122ee5738145/84637782499.pdfIn PDF document text
    • http://strandedtattoo.net/file/3235004998.pdfIn PDF document text
    • http://ridendo.cz/files/file/muxivixofalulilonikofovej.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/77843924779.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bd8469590---bodemuwapigapivotevuzu.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a07f63e5d80---didafo.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160847cc88d434---33863082464.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8dd6b1686---duvexafi.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0352b9750---67613242000.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160826a2da37a4---72986826700.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/5f7f339d7e5d2224d6be73f4ba09eae1/mujulakakunuvepemusewuvo.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/10754428425.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7c9718af---2154043029.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD86 5240 bytes
SHA-256: f75cf63e1c34c8070c66da80f61c12e9b0a214af3f15321286b207c51a128a66
font_01_sfnt_off0000df73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF73 10612 bytes
SHA-256: a3e05fcffb0171313c9754e574f092364238f8208927768e1f0538f792f94f9d
font_02_sfnt_off000103c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C0 16060 bytes
SHA-256: d7dbcefd5a9d087f9dbd48d87e5b82950a900fa0f666d4a1f78598b818f3f613
font_03_sfnt_off0001188f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188F 2792 bytes
SHA-256: 0ae6aaa7f9ff25c9f8375576a0001b294d82a321c4f24c342a5eb47a6f7cea8d