Malicious PDF — malware analysis report

Static analysis result for SHA-256 5182ac7d26e58f99…

MALICIOUS

PDF

72.2 KB Created: 2021-09-26 02:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 72fc136863f909aa41fa653a47cf2605 SHA-1: 2ae2bd0de024416c46555b0eeaccc58398b8d090 SHA-256: 5182ac7d26e58f9942e8a660a7b59d59cb7f10aaf4f6dc976d2d363c6bb265b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress upload directories or are part of a link farm on disposable hosting. These elements suggest the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.kymkarajok.net/tiedostot/files/jivigosodonud.pdf In PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/ruvuretezokerubimerefut.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c564ca9f61---kazasugoxogegerikedubu.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/42114603530.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/58021647121.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/furevowekajozefupavudawa.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/75c97fde5f9cc9dde4528bd625cfd283/dumividaragopogasamenino.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/37501490059.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/232391617.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210907205307.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/puxesudinuwijek.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/jomubemeno.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/30853171594.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/20831739520.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/67208154256.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210906_111706.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/27752755647.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/25463917326.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136c72d86fff---fonakaro.pdfIn PDF document text
    • http://tercovci.cz/files/file/nisipupefakitoju.pdfIn PDF document text
    • https://senegal4d.com/contents/files/panivuj.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/65382315281.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/luxamoni.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/14365820653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=gta+sa+enb+graphics+mod+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_off0000b1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BC 18668 bytes
SHA-256: 4306086075dab6c898def338d73d3d7f4eeec62c41addf7e45ad99938b259fa0
font_01_sfnt_off0000e201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 11096 bytes
SHA-256: 92c4bc7dca5995eb7e9a3a0989589bfa3793917de2b02ea4a3cee301346d153a

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