Malicious PDF — malware analysis report

Static analysis result for SHA-256 967caf26c5ec6c72…

MALICIOUS

PDF

85.1 KB Created: 2021-08-23 09:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 11d656fba1f48f9fe69b10e8ccf26d80 SHA-1: a542c344a537a8a0fdce8b0383a26f711bd4af0c SHA-256: 967caf26c5ec6c725b2940cde2c9b79312e08a958da058b8745883bf915dfcba
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The ML classifier also strongly indicated maliciousness. The primary goal appears to be directing users to external malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://krisoc.ru/uplcv?utm_term=talcum+powder+scratch+with+fingernails+to+small+crystals PDF link annotation
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/74916382709.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/53430769508.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec5b911626---93263348363.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719bc109956---ledepiduwakibude.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611db923d252d---46405019745.pdfIn PDF document text
    • http://mrybalko.ru/files/59279380903.pdfIn PDF document text
    • http://goldenrulelodge24.com/clients/860883/File/bedokilosojiberasusukip.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1d28086fd---xepisozat.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/8vsn5abbof01652bubd23aveub/91503106151.pdfIn PDF document text
    • https://schmitz.cz/res/file/vebukajupibe.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/71632523422.pdfIn PDF document text
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/vetinomeguwob.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/35418832222.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/faribeser.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/wofowu.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/dec0ea5d145d6737d2d15eb735041f07/86047885810.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/f523060503416ae205e5aac401e16eeb/dogapi.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/58687623977.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/eda56c0332f1f4ff17b2c359b5af2c83/bizubipibuwaledi.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/wufirogagiwelime.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/tavodovubodobunidozij.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b447fc06632---runanezuleb.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/0rgjne3va68evog2m1ab5tc0p4/7726427735.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/39167895167.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611047b97d590---81593197036.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/94572381856.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_off0000e72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72D 16468 bytes
SHA-256: a8b9b80cbc68b14c45caae04bf96630cbe750fbf574b1d8e94b7526301e571d5
font_01_sfnt_off000111b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B6 11332 bytes
SHA-256: 766d2f811a0d08cc17ccc82a32ccf5dd4c859049d1e2f2ee34d87246253edc5e
font_02_sfnt_off00012c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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