Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2ebcf2662e18db…

MALICIOUS

PDF

109.1 KB Created: 2021-08-01 04:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e200a55926f12b693787f1c702d1d7a9 SHA-1: b8ace7fde0216ee1c2c67ee5deb135ba99a12485 SHA-256: 4a2ebcf2662e18db9bfa27a9615b055815c506744c1a63a38d9dfdfb76e1422a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating it functions as a link farm to distribute further malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically identifying it as a phishing trojan. The embedded links suggest an attempt to lure users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f13643f63---90978698517.pdf In PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210504033342151.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/95399827956.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/85346893451.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/786fa61743acc53c2e700f5b5d284802/31945868389.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/479286ef9474dbf0d293317091d71839/92591262809.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/55218365454.pdfIn PDF document text
    • http://mtntoproyalshihtzus.com/clients/4/42/42f4769cb4f2467af64fea76c5682520/File/jokegasimefegujoxafubow.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/zudupi.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/guxuxu.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/65281a8492118609fa1ffa783dc13582/73896075167.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/9242iin0o91bblbv2igl15ov1b/71519837623.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/tatetola.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086728bd01d7---xajozepod.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/nubewogaluzov.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609649922ce7b---53528599582.pdfIn PDF document text
    • https://123natura.com/stockages/files/modikogupo.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/99025466205.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/bd2498i249p96h8n0jhdendc74/womidelomujabamanuwufipu.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4f480c2ff---31039675475.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/02b74b8083d5e1315935e6774129cf3b/22850180729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+many+kw+is+equal+to+1+hpPDF 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_off00013f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F28 11000 bytes
SHA-256: 9c9ee7958ff7d02d49f5af2ad5651b56580abc66459311c1c82c21d4e87b6ff4
font_01_sfnt_off00015898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000170aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170AA 21888 bytes
SHA-256: 34f845f0ce1a2f42867797b885a397123d80bc50607085c8a50a459b5aebbe2c

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