Malicious PDF — malware analysis report

Static analysis result for SHA-256 f597115c68394deb…

MALICIOUS

PDF

70.4 KB Created: 2021-09-04 22:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 338ace4f752fd3c7e9e47110bb11f2d5 SHA-1: c87e281ea870f23558f69419b7a8999be6876694 SHA-256: f597115c68394deb4c570e10cedefc2b186160a290b6f66888e72e091dceca95
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of external URIs and link farms on compromised or disposable domains. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 5

  • 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 http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/02bdfb355a568aca1150eb2c788acdfc/godamagi.pdf In PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/farobukezutonisewadurevi.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/89cbf2ebbba21588caf813fc2988e9b9/demeputivi.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/30257175009.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/7b8945800306df7d1221ee582bdb4d02/sudimizipogutogawako.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/kovamupililu.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/387b9827f55d6274c088b0701259fb2b/97649361024.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/panuxixuvixajumok.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/38205840783.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/86608704288.pdfIn PDF document text
    • https://rm-parketi.si/uploads/xitixokugisegipanaxa.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/fuzeriwis.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074495dd4f8b---bubad.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/82288468940.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/d6295008469d4f7ed3e3cd385fc3069b/nukifug.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/53583053648.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/vazubixotajixa.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16082033f7b4eb---wudedibud.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/56408450828.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/28033f2cd4538ddd2fb81fb0604df34f/misixapovuxatibadal.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/5sr6926q0i9g2hve13ksh4l4jb/84288863614.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6abf353d420012ddb053a795b94550d0/vogesiver.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608722eeca3ac---55213423659.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16102bc5d14008---72826014496.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6d728db30---5275575325.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/r0rkacnuf6f0g1855jtf6ngrtc/10524839051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=keto+fast+food+guide+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF51 10516 bytes
SHA-256: af289a8ad83265407dd57d76a86be350f0b3a718aa09429bd2c3c817f2a072e4
font_02_sfnt_off0000e736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE736 14776 bytes
SHA-256: 3f6a4986943a63ab9da5697fcb52aeada62c08f2ea83129b176cff1f81fff438