Malicious PDF — malware analysis report

Static analysis result for SHA-256 e787a11fee97550d…

MALICIOUS

PDF

79.3 KB Created: 2021-09-08 15:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9c6f90acb1d90c0594c30db56ef6f8c2 SHA-1: bc05eb344c2d6b60eee1aa444479aebed63c03eb SHA-256: e787a11fee97550d10956224278787fee0f87438c43acfe954c86a77f122ac5d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, several of which are hosted on compromised WordPress installations. This suggests a phishing or redirection attack, likely intended to lead users to malicious content or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://aordonez.com/images/contenidos/files/davoka.pdf In PDF document text
    • http://hbisan.com/userfiles/file/95893823742.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/tikubidupumotekoxisorurow.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/dewepevusenori.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/47599212334.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e01af22ca---27220430512.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/pivameperepoji.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/95915693756.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613077bfe35b6---52871779540.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/basibuwuwo.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dd182f773---fuwugezagiraxajuposobigu.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/28214041514.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/rawuva.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/0f7cd1bd3328efde6b058d59cac2e291/ridezorisebipanowogi.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb22b0403b---38529999592.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/zedabebovisasa.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/kinosilajazutowibef.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/96327345024.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/53673233940.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321507cbd7c---60732425673.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/fagupizadiri.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/vixiponodanaxowaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=passive+simple+past+worksheetPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/43539822427.pdfIn 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://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_off0000d203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD203 17568 bytes
SHA-256: 9c0761e319a414c698dbfdf801f60556e8fc124704225c18d2485af3632f4f4d
font_01_sfnt_off0000ff68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF68 10656 bytes
SHA-256: f128ec277ea99d932e2bf7dda4c27f5318d2959e68c1b589d7d886bee7c28389
font_02_sfnt_off000117e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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