Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeb50d158ab54ec9…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 18:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0958d63d7614fa2acdab09618e04cf28 SHA-1: 2a5c8f9b77baf230ef340127336682931d0c7277 SHA-256: eeb50d158ab54ec9c9c11b2dde5b9d43d3eb7a9998daf4080ca3ec5559f75fe3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of a link farm and the nature of the URLs suggest an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://volker-issmer.de/userfiles/file/katitusakibozitixe.pdf In PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/58760182562.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/sepilugegiz.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/momuzimipuduvasizemufu.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/54462821120.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/94516983185.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/luvapemupilus.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141d58cc3ea3---wuzowefibi.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/rogugamosorenilasudep.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/5971907939.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/vozuniwibijafuzi.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/64460089071.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/40448975574.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/logotadelozadaxafek.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/35510852624.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/gezewiximete.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411003ea1de---kowuma.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613752a3434b6---19091566111.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210909_9FA09CFE498640A9.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/xorawegemofunigot.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161379e3a31a1d---fekiliranowajisotobakekib.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/82945476242.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/55966116393.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/27779636903.pdfIn PDF document text
    • http://abwva.com/uploads/files/84421363962.pdfIn PDF document text
    • http://origo.ws/userfiles/file/24399907157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=mp3+player+mod+apkPDF 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_off0000d795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA7 16664 bytes
SHA-256: 905251d7c576614677cf824a9e5ba3bc4ccdf36aa46961f22f8c49c9dab3a6ce
font_02_sfnt_off00011ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB5 10464 bytes
SHA-256: 0827a7c5ad05b2a92b005118e7497fc56fef00b8220551b370c92a874cb82704