Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c3348842b245be…

MALICIOUS

PDF

114.1 KB Created: 2021-08-14 17:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 32ecd3a50e204c30663cf146218bebf2 SHA-1: ed2e223d3d0b26eb51d5a80ed89302276ed30d53 SHA-256: 90c3348842b245be927a5ebea0bfa696478a27a87ccee093a351ba0704e4f4fd
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document's structure and the nature of the URLs suggest it's part of a phishing campaign, potentially using spearphishing attachments as the initial vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/7f42b8f9be42bcd5797a9e58adfde37c/fabowub.pdf In PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba93aded0---84156829375.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/s1d97be7mi4q0rqme4atpsmap1/53934322542.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/e85522df4a2417ccd6e97f8123377ae8/50315080206.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/snhjc1on1hi5k2fqc4pe7eo0p4/37326129722.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/suxuxesixajip.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609063c44c21b---jegifa.pdfIn PDF document text
    • http://unseretochter.com/images/file/riwim.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95061470e7---60881707732.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/3a623c2f19cec347768772737c4e7670/mixarozixod.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948b90834aa---66097830995.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/9dff11703d2312d8c014fbc7d1e09207/toroselivanud.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/bijesoj.pdfIn PDF document text
    • https://reniuved.it/file/refir.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080eb10be349---jugejitirus.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/25639273565.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/sivamiruwabotofenozenuke.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/a3063f66ffa079b705405ab62b56691d/dozujokewezit.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/gumajuw.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/rotesepejesesu.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe8033c154---44981392926.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/babolaxitexu.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/39b167d4eb7f261b4342d5746ee3d459/pikepomukozekuku.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/nifidekewimoturonowov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=como+quitar+la+herramienta+cuadricula+de+perspectiva+en+illustratorPDF 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_off00015459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15459 19224 bytes
SHA-256: f42c01ecf9e98d85c72223395d5ed973b294fc32de23651439a88473cefc14d7
font_01_sfnt_off00018605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E1C 11124 bytes
SHA-256: 7b7c19d3035b7a190964a024ca32737d824736ab0320f098f2ecf49c7bdb320f

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