Malicious PDF — malware analysis report

Static analysis result for SHA-256 d12bcf663872ba29…

MALICIOUS

PDF

75.0 KB Created: 2021-06-27 21:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0ea5cc501916330b9659f0b29f9efbbf SHA-1: d9429264f01dc75e01b3e444de58e1f4ae9fb481 SHA-256: d12bcf663872ba294b23ec3793bb5cfc6c1077da0172e06d01c2509d0485fcf0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress upload storage and disposable hosting, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd992bc0b7---17899678507.pdf In PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160743e6c564f7---57748036046.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/87749881939.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/josedididunafetojejowebem.pdfIn PDF document text
    • http://biosite.ru/images/news/file/20417411889.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/10914703280.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45218b608e---48028658942.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/59715872204.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/bc8bd7da774491ac8f10381b3886ec2a/44521253804.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/55113110561.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/u85bu03dp8dp5sl6vegmvh6qa1/naluro.pdfIn PDF document text
    • http://novichiha.ru/pic/file/38910451343.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/73661476714.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705a2c05645---61451519180.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a5f8d24e5dd4db8b653c21da0aca572c/31905948112.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/mugaxid.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8443b824c---48305475969.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080acbc93859---18503685549.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/7138ab2c9bb7b65aa497a182bea00350/42076936309.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/38942415746.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853ed90d4eb---suxonumamawemolewi.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/22875704271.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/44539438380.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/tovuzudekemagerifavole.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/ziduso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=inception+full+movie+in+tamilPDF 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_off0000c375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC375 16720 bytes
SHA-256: 40f9834c3bcf0593c24d4f247cedeed9433c3e66407080c4719ae68fb891720f
font_01_sfnt_off0000ef00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 10492 bytes
SHA-256: 03c0576b592fe5e842a40baa88bd4e4bbc5ba543dcc6d1d61d342e1c4e96dc1b
font_02_sfnt_off000106d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1