Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3678fa08fc9daae…

MALICIOUS

PDF

79.9 KB Created: 2021-09-19 00:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f6f825077a29dee5f51c224188a2a2ab SHA-1: c7b861ba727f11ecfa9fe9bec7c153ea5f4ec882 SHA-256: e3678fa08fc9daae380b185ca669d19ce24bdb965db6916f9a12e65d6ab8e94f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=speed+post+shillong PDF link annotation
    • https://livbiopharma.com/userfiles/file/xegelezedadud.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/34953480657.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/5a0afb8b827383daf0a71dd10db9f96f/taboruzerepuvanabekapoto.pdfIn PDF document text
    • https://tch.lu/files/files/tiziwodi.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b9bcb8c01---famidaxixopusepozize.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/85710176161.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16139f80a20aa7---8545686532.pdfIn PDF document text
    • https://superpart.com/files/wupeguvo.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/55345260223.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de44116874---bosuwogudosukukulare.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/mamubamigovazorawa.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/56045960165.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/tizisarow.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/16612996181.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/88014661310.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306029e5b75---50033715373.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/t4f7fdl0kra3k2psuj1sgus9nf/diteraguzogedakufinep.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/dorurixeva.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/54548929798.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/dd70b798fbd517a4909157684fb36557/62800266426.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/segexumabugu.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_off0000d618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD618 10484 bytes
SHA-256: 20a10bd202e0dd32ea3d1d7f7d3e0417423cf99749c9e5bd29bfe28369ccb15f
font_01_sfnt_off0000ed96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A8 17344 bytes
SHA-256: da026ab0ed50440652e275f2d12d8d62d7474fa28a13ea04a1efe001839d9a42