Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff85edcc603d55a0…

MALICIOUS

PDF

94.2 KB Created: 2021-07-03 07:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2f73c432265f403aaa0c938fa4a5624f SHA-1: f78bc81e658489298856ea0d3da5bb81439dce45 SHA-256: ff85edcc603d55a0899478a100ff0e24d847f8d62d2bf21ed0d228b82bbcd0ce
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to WordPress sites that appear to be compromised, serving PDF files. This structure strongly suggests a link farm designed to lure users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/quoctrpb0a5ki3i61fdvoqr9h0/70972143780.pdf In PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/9846c607cef6fcf89dc489efbb5a76a8/bilabivinike.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/xiwop.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d2166b39e---15440835394.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/903360e838c4384598a72bda042cf234/12000500130.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/fagulalazuji.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c58578d31---43909164253.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/larunowanumu.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/6101959866.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa9139e7c7---xugetuwetufobagisoluki.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/1253d2d4f3c66da9360a59104aad9962/bisotijopu.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/26f584d72acb94411aec2262adca4500/69552114981.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/76404609057.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085f0d34347f---vodiralegagomixiluxuxefif.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/kuwomilodube.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/a8e40592a3775e9397b6541565c66682/jefutikuwanisoziguwoze.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/fgbd9sri55fdcggfrokfnf506p/zulilubixejulunugu.pdfIn PDF document text
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/84231173061.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4748e196a---xujolepovejekidon.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/813b5a5f5b36bf42a7a0d4239bcdfcee/28499881136.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/50995415094.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/e8f5f44b4560f5ff0ababaa12db82f4d/mugejowubuxojakimo.pdfIn PDF document text
    • https://2acontractor.it/images/file/1473253563.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d67f2d38975---93242978756.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/cf1d0acc6346c6ceed6181121f6f6831/vorebuturedelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=facts+about+kuwaitPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF437 17040 bytes
SHA-256: eee3626e645f0050ed1b0f0ba4aec5178f05cdf4dbe67c109253eda0515dc446
font_01_sfnt_off00010d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001255a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255A 17492 bytes
SHA-256: 2fc53581ed9dba9d8b8ea68324597e263ee075ea3d9ef0da4d60b6e046cf9bf2
font_03_sfnt_off00015249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15249 10236 bytes
SHA-256: 66c44eae072c36c5283504bfdf16d5323bf0783801068b0a385a65f398e493b1

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