Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cfa03babc9e2509…

MALICIOUS

PDF

90.4 KB Created: 2021-09-10 03:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e0cc7d00029d890fdb9e534901d90900 SHA-1: 132cb9431c9935b8f4a544d22ad1b36d535cac5d SHA-256: 2cfa03babc9e250962bf2e8ba0f2275ce43e06f1b24e54af8fa1a9ef3194bf11
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to external websites hosted on compromised CMS platforms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://marsalanoleggio.it/userfiles/files/pozosusaf.pdf In PDF document text
    • http://gmicropilotes.com/uploads/files/42335449547.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/kalifuvifegaz.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/gigokavunama.pdfIn PDF document text
    • http://www.siposferenc.hu/html/1094520100.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a068b582f6---15424312588.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/kilebal.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/fe38e1c7b38a846ac0de7e81c297cba2/guxitasogotanamaju.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1c0863cba---tusuxokaluripos.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/62751378941.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/52690065656.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/10566564142.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/rikarur.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/xuzufexupitem.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/21121738912.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/58037773048.pdfIn PDF document text
    • http://grotech.in/userfiles/file/51447713117.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/82131271799.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/49023709406.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/fizatakiravapekade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=summary+of+the+giver+by+lois+lowryPDF 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_off0000fec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DE 11140 bytes
SHA-256: f5656d5a440db532761063a5de41c07fd98f7e461fd9cf5dcdf66fb2d9ceeb26
font_02_sfnt_off000130f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F6 16760 bytes
SHA-256: ccfa7c5f4812dc2669cb6ff7c5f3f897e8cde6dbc5221bb4c2e17c5ae21c1e7d