Malicious PDF — malware analysis report

Static analysis result for SHA-256 0088861a64175ca4…

MALICIOUS

PDF

91.2 KB Created: 2021-07-29 18:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 18bb7ff63c089ec9f85dc0cb0b41dbdb SHA-1: 303d194d97f2e3475e6abb09a5f2c557618ffc88 SHA-256: 0088861a64175ca4295ada1de9784f48cf5d1c3fdc327c11a2be04b9543ff255
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The file's structure and numerous external links align with tactics used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://chcial.ru/uplcv?utm_term=what+is+the+full+meaning+of+cpc+in+civic+education PDF link annotation
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/09ffe31727e61df5dd31995572f3691a/29582138717.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/hopipconr5s0g0qqquppo67pi4/6838128976.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160deff3b16725---49489683406.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94bd94923b---suwoxebuluzigiwiru.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/lunarolesozob.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/eed6daa77e0ddac2b376b411048bda33/nikudemalotobedatokizo.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/luxopo.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/64282135378.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9471f0b6cd---rarimaxujafuzakovelofuk.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/66717051252.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/zunaxaxun.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608b823061a07---rozemuxetiximibupevog.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e89e237d1b6---kazexukap.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099209e7cd5f---gijizodugi.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/govutizumulewitir.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/775a09bdd2962e97543120ba9d1c82eb/kazorejuluvanefosis.pdfIn PDF document text
    • http://ausafe.net/images/art/files/rufufevevapujizuk.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/8c4f0add8e0f286dda73a68a1cc14270/62707995586.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d9173a11f91---bofofanopawarikot.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/maxixofi.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609219f1583e0---4906556902.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725a10414e4---fifapimopowuxusirogijidum.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/38948661221.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080dd3fb5314---lalutujasezogot.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_off000101e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E7 16512 bytes
SHA-256: fce0658c442260717f143a890e09f5cbaad42474e8b330544b026a5a79642abf
font_01_sfnt_off00012ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144FB 11128 bytes
SHA-256: b06043a3d8fe020aa9fbf1406332468941e893a8e386d97bca965293fc74b667