Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c908eaa1e992b99…

MALICIOUS

PDF

88.8 KB Created: 2021-09-03 07:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cd33c6c12f9e168b94e8c078842e5178 SHA-1: 6901b521e8f695360c02e50182510b95b6f76e24 SHA-256: 9c908eaa1e992b998f050587f5df426e4bd014d61d3d6804f75b2464cb466975
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing campaigns. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a1eb19158---76497679186.pdf In PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12089eec4f---48429591851.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/64225034796.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767661b5961---xeromipinagipadi.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607270484053a---32291507599.pdfIn PDF document text
    • http://s-box.biz/upload/datoteke/didonax.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb023afeeb---27981914065.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/29280165319.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a542c0d3f---77171526217.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/b1fd123c1dc2c0e01cca92a98c390a21/vedewefuzinozulajukagaxaw.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/95650062403.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079800c9edfe---bibapopimeguwabadedi.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/72h9ddlfc9b3frp1vja3c4grl1/99790521770.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/gutewerifovafurusewekil.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb8fa13907---jatewoxegivezolubapanop.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/01ece42d231a46b254f31acface1966a/68480379270.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/wimunikezupalebavi.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/74951360654.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/52001410407.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/29615061981.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/43534f70d12c70618546a50672561360/zenizejoruwuwelakenot.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c65766766d---vuxagavagafar.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/maxurewomopas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=critter+and+guitari+organelle+manualPDF 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_off0000f226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A38 19184 bytes
SHA-256: 26cc044cebc04a394e9e0e3dbd30fefb5eb0ed22171765f33b9e84bda7047333
font_02_sfnt_off00013c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C47 10552 bytes
SHA-256: b69cd8733b60592fb7d4c34ce05dc7386498eb373a571e276c1e78be57ab0f4c

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