Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83635315660b20f…

MALICIOUS

PDF

80.4 KB Created: 2021-07-07 03:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7709e317bd4a90abeddbdcb38a6e5f9d SHA-1: a29f5bfb9487cc3304e42416d63a10fc67d45f36 SHA-256: a83635315660b20f9863af5227707ea67953e37ce54dcfa564731d907cc0331e
124 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ClamAV, indicating it's likely a phishing or trojan delivery mechanism. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites, in turn, host further PDF files, suggesting a multi-stage download or redirection chain. The embedded URLs point to potentially malicious content, such as 'free minecraft apk for pc', indicating a lure for potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2676

Heuristics 5

  • 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
  • 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://ketchas.ru/uplcv?utm_term=free+minecraft+apk+for+pc PDF link annotation
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160707f6bef377---zalidelimoz.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/87878330175.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ff5c2e016---78339552079.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee18022517---suterugawovut.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/wabegixab.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6724147b38---periwamujotow.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/51577234520.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/9388028329.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b259b601774---gobuwirejikibotivinelozu.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160850b611e13e---bufatipasipinekusumaki.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/50917302499.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/tusula.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/cje4l34taorpmu21jqbluhn7ko/maxowasijuz.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/60828452165.pdfIn PDF document text
    • http://thebranchoflife.org/clients/3/37/37a84c4c47f147f839b5d5a44bb1b86c/File/94718751617.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/aqd86ne1ce0542256adrs27g2u/voneraku.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa17aa0944---48257574911.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/55863520803.pdfIn PDF document text
    • http://moffatcountyhighschool65.com/clients/878592/File/19411702755.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215191242224882.pdfIn PDF document text
    • https://altbuket.ru/files/11855826856.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/23f26583d4f684259ec181238bcdf2a9/nenofuresurenolol.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/he88ajbfdode3t1ofmic0dg3o1/befuzefeve.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b101f8a7b2b---72306057539.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/gejumobo.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/689da3671d9e0e1a6ac14ab6f324a073/molulopepomejuletokob.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 10496 bytes
SHA-256: 6186e3fd4e88b1083e4ce6258e5edbb7d8c527eedeb193b2722902fd20fd49e1
font_01_sfnt_off00010a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1