Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2133a346ff58b47…

MALICIOUS

PDF

71.5 KB Created: 2021-09-12 02:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 19161cb76b877334d475616c87bbce10 SHA-1: 82a2d55564e7407d8859ef93890ca69dd71e42b9 SHA-256: f2133a346ff58b4781fdd0ffcccc6fe384672e111fe90635167fe5c9e4e51f24
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm or redirection scheme. The ML classifier strongly indicates malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or malicious content delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://pixomot.ru/uplcv?utm_term=media+player+classic+for+android+free+download PDF link annotation
    • http://bpsstudio.hu/uploads/gumupakale.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/fexurod.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/fafenibanope.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/kasepovuge.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b114c5fb2---69990145827.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/11662767901.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/lotezixesafumatirefudo.pdfIn PDF document text
    • http://mamitobe.ru/files/file/zomusemafomarewamaj.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/4245199ba76700e996752dc2b6c94b39/59711990529.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/1d34dfb136443c9360b8dce8ea2b7bcc/zirekakewisefipojumofafab.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/tixitotefuvinapozuweki.pdfIn PDF document text
    • http://lscapital.it/images/file/8096431895.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/57440099959.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202108312229266648.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18528672742.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/30759484596.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613032ac02b0c---zokutelodejuxovopiwo.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/debifof.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/87664945873.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/mudivetosonemopiz.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/fefegininisu.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/96368228116.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/22725616818.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/88234726926.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/97410334792.pdfIn PDF document text
    • 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_off0000b867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD079 15200 bytes
SHA-256: 3d9c592de7cd1b5543fa95f8acd9d5f3ee073271e6d5ee24264f8dd946baf263
font_02_sfnt_off0000f718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF718 10708 bytes
SHA-256: 7b1b61f9c905b3cea7bc87c4d30c1afa49f2edafd79745062a4deffb502e15aa