Malicious PDF — malware analysis report

Static analysis result for SHA-256 00001860f9a1acec…

MALICIOUS

PDF

86.8 KB Created: 2021-07-20 00:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e86234a08e934eccebafa1d9ef6138b5 SHA-1: f139cc53769a8f1232d85ffb56578f250e4dedd4 SHA-256: 00001860f9a1acece685f7cc1ad755c03b0cee8083beaec6066073c4fb6c285c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. ClamAV and an ML classifier flagged this file as malicious, specifically as a phishing trojan. The presence of multiple external URIs and the nature of the links suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/r5b0ik4ti4msof7tj69jar20se/73975844739.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/59cfff4b71ee23e7e403b2989ff9f929/suwasevekile.pdf
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/60681051113.pdf
    • http://tubietelbar.hu/uploadfile/jolew.pdf
    • http://parentini.it/userfiles/files/wakuzolew.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/oasa7fmk7jo89l6prf8c85b7n0/tilomuvutivub.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/um9mjegikme6co86jksinsihg9/putedexifaxivuresokazebim.pdf
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/nitigoxepepa.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a97dea9d250---12531273200.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/4b4c98cef60cc52fbbd6e09d282c735e/wiferemujusagijesewagediw.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaeec820e3---pubejizuwidufizadatomaz.pdf
    • http://vanharteyoga.nl/uploads/files/juzagixujebabazuz.pdf
    • http://mikailang.net/userfiles/file/20210702111351_1028268258.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/d36e4974c49bf9b6fcda13e68443851d/3020100439.pdf
    • http://quaint-house.com/images/blog//file/gixixuvodagisagojopovuwa.pdf
    • http://straub-online.ch/userfiles/files/37412305289.pdf
    • http://aivieksteslaivas.lv/userfiles/file/15223847136.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083db045ba34---minitejigexadikoje.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608befd3b8316---tuzezuvi.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ca72e808270---vupasogosemeda.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084d99de51ac---56130529189.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdaf9d642c---76216170925.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab07809fbe1---nexesekagojekefisamawe.pdf
    • http://ibconsulting.it/userfiles/files/kupon.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4505911db---14258468679.pdf
    • http://a1-automotivegroup.com/upload/files/febubelati.pdf
    • http://dienmattroigiasi.com/uploads/files/vobupodas.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cookie+butter+cheesecake
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ec.bin
ff3f04ba95766f4f4866be825257b91dedb8b885faff156c528025be3538fc70
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EC 17024 bytes
font_01_sfnt_off00011d69.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D69 16792 bytes
font_02_sfnt_off00013580.bin
86f24d502c32ee193d644b6054e7c93e6119e8f2a3b36b5cd5aadffcea11208b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13580 10540 bytes