Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c5bffba5ba01865…

MALICIOUS

PDF

79.4 KB Created: 2021-09-08 04:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5e1199961b0d78656a469a2bdb69f68a SHA-1: 39f3e5e7acc882fc9c25e904be3070292f62a5a1 SHA-256: 1c5bffba5ba018658c15e7615054367c614f8a314ce020a2258afae171998522
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs pointing to potentially compromised websites or link farms, suggesting a phishing or malware distribution attempt. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates the document's primary function is to redirect users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://pixomot.ru/uplcv?utm_term=encoder+and+decoder+theory+pdf PDF link annotation
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/pozorevokifogiwovago.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/46578735759.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089c8e86edef---66808357379.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/3130cbdee5983e21bb5bb7215428651a/venemubokaganuwujad.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/23109729220.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/wijake.pdfIn PDF document text
    • https://casentinoshopping.it/file/pidisezojujimotusor.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/nukamibujel.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/xekobonopubuvo.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/84087604715.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160917d4329011---62995139854.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/57765437a13fef3fc2630a678e222b58/81164659879.pdfIn PDF document text
    • http://jarosi.hu/files/file/39081672390.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb8af5cb7e---vejafageg.pdfIn PDF document text
    • https://fishboat.hr/files/3150736538.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/sosisu.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc08b688e1f---xobesifulivur.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/sudepifowufigexotumog.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/75413032232.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/23d731c7f1a94e77c0d4deb2b359569a/33549084096.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/s6g2alqisgk7i282dddu77lkqt/75690700741.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/31093801937.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/4332096894.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_off0000d393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD393 10508 bytes
SHA-256: fe47b735bba59c55039a3500e85a29a58e150dbccf3ecd4ddc8e73f2ae442aff
font_01_sfnt_off0000eb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6D 17096 bytes
SHA-256: 85014a31405a422be54cec8ff5070244916a65004f38cd96e486ff90bb265185
font_02_sfnt_off000117ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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