Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b53bc8b060f52c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 14:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f59c9e5210cab82dda0168ca38df821d SHA-1: f12cbc3412903a47173c45a5b7fdbf6b76f93c44 SHA-256: e0b53bc8b060f52cd9d8e71307369fa5cfd8de2915dd1e3e8b12b1d3a506a5bd
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://jackinthegym.com/uploads/files/202109132350049541.pdf In PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/29020196184.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/16601673758.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16146049ee45e8---39286906891.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/6686069848.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/otucmsu8d7klitrl1sk1spth69/78609271600.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/84779268182.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/98833040980.pdfIn PDF document text
    • http://wdnederland.nl/file/13394315600.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/tusavaralagedagaxowabotok.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/13243880458.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143fc5594d0f---satexuwadewubobi.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/vapija.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/93535926011.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090807351473499.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/vevefebojivo.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/87044691697.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/75127742551.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/verewiwawanet.pdfIn PDF document text
    • http://rld-carbon.ru/file/pusijifunukub.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/gudid.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/8700456246.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/2909510429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=best+dua+for+motherPDF 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_off0000d7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F3 10532 bytes
SHA-256: 77c35c2018899e738e17697ebd54361c9bae480503699d541056e71aa51d6a24
font_01_sfnt_off0000f002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF002 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10814 17820 bytes
SHA-256: fe29251e721f479de1c13e0d3eb4e7e96f12eafbae52d4b58bd159d744c151cc