Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d7d8b725c38c88…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 22:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 005caf2d6db52874c5f5914aa97372f2 SHA-1: ac219ac89db59f30929aba3f434c23bc7e6331b8 SHA-256: 82d7d8b725c38c88d9f377d94c96c1050e9f35e33df3e6145e1951bdf437eac2
156 Risk Score

Malware Insights

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

The PDF file contains multiple heuristics indicating it functions as a link farm, directing users to various external websites. The presence of a compromised CMS upload link and a high ML classifier score strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://reclameindex.nl/images/uploads/75055863314.pdf In PDF document text
    • http://kvbm.org/pds/userfiles/files/48175601589.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/69845691010.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/95044478128.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/46894279088.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/54765493295.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/65662280309.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/jezoxupa.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/zapebuvepiwubikomasemute.pdfIn PDF document text
    • https://defi128.com/userfiles/files/88469097175.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210921002527.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135836f6b81c---venijazubupegakuvusununo.pdfIn PDF document text
    • http://guchen.ru/d/files/kujenofogesaxitulunarite.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/8cff46f9bb9575953731c81f56c967ff/liluvibafur.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/kazavawagerawonapuko.pdfIn PDF document text
    • http://ladna.pl/user_images/file/vikopema.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613250c4220f8---netiniwesadol.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/49938913857.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad863f1096---varazanagizogofavadijurib.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/12123958859.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3a4c3a09d---berezijorabuxezijipu.pdfIn PDF document text
    • http://akatumusics-ang.communication-pro.fr/public/1283/contenu/file/64953791947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+pull+up+old+text+messages+on+androidPDF 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_off0000b103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB103 15532 bytes
SHA-256: 2e3f16b4d30ccae8801a75ee8238ac8113acde7e7d565a4c7663109eaa08cf0c
font_01_sfnt_off0000d81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 11012 bytes
SHA-256: 250e3b5a92b912b9aa8c789dae1cbcb381235437309b7e6a3ed2d228277fa59e

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