Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c16a335d23763eb…

MALICIOUS

PDF

79.9 KB Created: 2021-09-07 17:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: baa093c78410e61c8cc4ca880e88d253 SHA-1: 227ed94f16e0ae1cc6f6cac5f398d86d24424ff1 SHA-256: 6c16a335d23763eb78b3fdb06cdbe161cc47586d9cec8e6ae509057329dd5df8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to other PDF documents, many hosted on compromised CMS uploads. This structure is indicative of a phishing or malware distribution campaign, likely intended to lure users into downloading further malicious content. While no scripts were directly extracted, the PDF's nature and the heuristic firings strongly suggest malicious intent, possibly involving the exploitation of PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pendekaremas.com/contents//files/xogogibamu.pdf In PDF document text
    • http://stalmost.pl/userfiles/file/6430235335.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/38oflef5cvqjaupflc9aogivm3/28172260850.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/70138469986.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d10e815c32---suranudumepudupelodowixi.pdfIn PDF document text
    • http://imoroz.by/upload/file/xikenarevisi.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/72094327445.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/adea57952584c995e98079f49c567284/lofemikisetedesufevuxo.pdfIn PDF document text
    • http://dade666.com/userfiles/202108file/2021082507185470554.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2ca8b4605---16476317585.pdfIn PDF document text
    • http://grossfamilyreunion.com/clients/0/00/00c8ca1d7e0432e0ca4c178cf0a97985/File/rugedi.pdfIn PDF document text
    • http://pezenasenchantee.fr/userfiles/file/18946471530.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/2910966be7232290e1b9afd85daed0d0/megixopuravabupi.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/85944154763.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/631166a6d875532d118d7b0e0e7e6d0b/kiputifepurelopaboberisol.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/v2jrc3hsktjrl9oa1jgb1ac8po/popujafizefisitaxajulujo.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fc5b2c8b008---85449260117.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606f09d7657b0---13933639577.pdfIn PDF document text
    • http://canadanur.com/resimler/files/13325620440.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/31nnnv0hgmbrdkr0gu136aaqfq/kiruzimaxilijefobopixix.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/luvexefasaduzimezine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=tag+questions+present+perfect+exercises+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DE 11060 bytes
SHA-256: 68e2a9175253c16b811b47470d2b5a5a37db39539f238b5d90b05865d26df922
font_01_sfnt_off0000d144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD144 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_02_sfnt_off0000e72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72E 18600 bytes
SHA-256: a1688a7b7cbf33f22852ffc0e2dc98966588a45ae579df6ced972263ef92fd7a
font_03_sfnt_off000117c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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