Malicious PDF — malware analysis report

Static analysis result for SHA-256 6819b459fe159d3b…

MALICIOUS

PDF

78.1 KB Created: 2021-08-29 23:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1c86c75010f8bc2782785a7ccf5af6d7 SHA-1: 0dd1b11dc757040bb99b59cc821afbb8be2999d7 SHA-256: 6819b459fe159d3bfc892117066c1317b930e96245b39937c73933645c1acf16
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns suggest it's designed to lure users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://spreewaldatelier.de/img/editor/file/52081216575.pdf In PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/1484748056.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/f37d325ef0df6258362313d4e8f8aa97/vegunidopivarazopeno.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091bac45d9ee---99073306562.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/59059021510.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dc1153f23---95445342643.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1c3db258c361b3a37633744b00395b0/govokuketilewek.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/26313488d31c8513693bc10b2813a7f1/99851164760.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2f8845dd5---59240349153.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/91338342789.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/70532105382.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/c58139f7898e86820e9470d38845ea05/76722440347.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/bf9663f4badd6ec5e73bc8c67832b578/pepilewakasukaluwujeluzur.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/6a8b2a0e745ac4786a0a4caaf4a05f98/66651348350.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/dugukowivuganitizegup.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/papibenikobipi.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/sulokepalurifakodalari.pdfIn PDF document text
    • http://synergyproperty.com/images/files/14481359685.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/fo7646ar0et4p911ris9vum1e2/zalajewiwev.pdfIn PDF document text
    • http://klassn.com/ckfinder/userfiles/files/nutapifazofapeb.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed993f8740c---jijebuxi.pdfIn PDF document text
    • http://belloverde.net/emailer/file/basifez.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608888f716144---20263647578.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161049eef107d3---barekazopofifon.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/7792988407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=names+with+violetPDF 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_off0000cb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4C 18396 bytes
SHA-256: 3398eae906beff56298b7f94aa62f1472dee13e69fdf017b31768748a3674446
font_01_sfnt_off0000fab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB4 10300 bytes
SHA-256: 223472e3d27cf96b779d67aa815337c6df50ec797e5007e0b9b40b9aa52a047c
font_02_sfnt_off00011200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.