Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee0d6c8588b82948…

MALICIOUS

PDF

100.0 KB Created: 2021-07-02 10:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80c87cd25f3faeb5ca0704d3f3cf66e0 SHA-1: bb890123be8a4e605ff58674c0215c002d3bb9c8 SHA-256: ee0d6c8588b82948d7699d16920afe5514d941f6b8f4f5e523808bf8dd553ebf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common technique for distributing malicious content or phishing lures. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abbcdcee31b---86139616682.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160dd80c76c351---50261493036.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607678e43a262---87703436877.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/tisfvda8sts277udiqriipiutg/wenabidawegob.pdf
    • http://hghs61.com/clients/9/98/9814c5f28b4e93efd1f74733a9fd6b0f/File/41107322887.pdf
    • https://carparts-fixture.com/file/file/19717314086.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875bbed3de8---tebegidipujugixa.pdf
    • http://conblocmanado.com/pics/file/25487163709.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b351ceee2b---begiwizovixeramagerefuwi.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0b3fed8dd---33696105680.pdf
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/72059522882.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608204622319e---jewibel.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/e56792a5a24aa6e00f824f9ed67a50b2/59606258100.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/hkst8684uevci41sjgmpeccft5/58777257095.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc32d647b9---gelidijofe.pdf
    • http://jpind.pl/userfiles/file/68483439155.pdf
    • http://automsystem.com/UploadFile/file/20210515211624673.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160907b27cb240---95250708769.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070940992639---bopevonozojo.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dec4d6b743---bemovepipumolumatuw.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/2cb7a104ebad2c7c8f05f9d9dc0de5e4/91752547822.pdf
    • https://braindevelopmentmaps.org/userfiles/files/91915338066.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=class+4th+evs+chapter+living+and+non+living+things
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012243.bin
0563ed08c81090fa31320567fd63101477312fdccd475dd696a7aca9e685f1cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x12243 18104 bytes
font_01_sfnt_off00015139.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15139 16792 bytes
font_02_sfnt_off00016950.bin
043d132da1dcf1cfaa16f3d8654e684244ff972f80a877f6e1309df86ac6d519
pdf-font-stream PDF embedded font (sfnt) at offset 0x16950 10968 bytes