Malicious PDF — malware analysis report

Static analysis result for SHA-256 29707a0f2b2b3c61…

MALICIOUS

PDF

85.8 KB Created: 2021-07-14 01:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ac82ceb5190dcc240383ddf334cbf66e SHA-1: cc19934c7df9a14636667a9e77b8eddc2c6a2762 SHA-256: 29707a0f2b2b3c61cbe77c5e8acedf4285ffd780d4231b27cdd6fb967239341c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=converter+of+active+voice+to+passive+voice PDF link annotation
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bf94a4aed---kazivanudotire.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a213c2dcccd---41639242184.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/buvisu.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a22ab7dc335---povumuwetig.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/0184381821b6ac38797b7a6dcd51e3d5/pejinerij.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/pk0gbrrlh5j0teaa3280d71gi3/wetegolefurop.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab91872db62---95475250491.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e0cd559f775---lovivuxotezusi.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/3eb19b72548c2fdc2562c984cd2b217e/fidaxadof.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/dosiwojozaponedati.pdfIn PDF document text
    • http://hilltopperalumni.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/32851118315.pdfIn PDF document text
    • https://ubranni.com/uploader/files/nefobabesanigef.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/28091173911.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/58417386e955edf0dcdf62838c525938/mugazeguwafetamawexavuf.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/46442622175.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/xuxabisepizejakawu.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd976493cb4---sosajodigema.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cccc053bdf---15039683444.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/25032455019.pdfIn PDF document text
    • http://secretinvitation.net/images/files/zafasuvopezowanoje.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3aac34715---91959639869.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_off0000ee72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE72 10524 bytes
SHA-256: c53386dd7c342c98de0df5cd7c17534c6f0b6c781a78de7d500d796e7b1bb289
font_01_sfnt_off0001069f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069F 16632 bytes
SHA-256: 72034337877764600ff5a2f10634f90f8e9eaf5037f8b4c58d9e006cc939a6a4
font_02_sfnt_off000131f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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