Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e761eee9df7c6a…

MALICIOUS

PDF

70.4 KB Created: 2021-09-04 05:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d958754fa332573f2c16f33c48c7047f SHA-1: 20cc20ab484c859a3ea917a849ab53dc2f892d43 SHA-256: 15e761eee9df7c6adb4a401b14933d43258fa987932775fe3c2b998db728c993
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded URLs suggest an attempt to lure users to external sites, potentially exploiting vulnerabilities or tricking them into downloading further payloads.

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://yuha.be/_files/file/80706223659.pdf In PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/vuzofe.pdfIn PDF document text
    • https://davaocarrental.com/images/file/63265394688.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/radawobojuvuguxaxe.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/lezosajujijosona.pdfIn PDF document text
    • http://hasyo.net/files/file/8169994299.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921643e1267---27373335379.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/27998624519.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3aee8110b95df4a9b7c7cab402054cbf/ginesosososi.pdfIn PDF document text
    • https://kartplast.com/resimler/files/renopaduxoka.pdfIn PDF document text
    • http://flexa.cz/docs/file/tadepodutofori.pdfIn PDF document text
    • http://sns.hu/_user/file/64339226933.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/xazuzikivafijituvipozuxa.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/3819233106.pdfIn PDF document text
    • http://wdnederland.nl/file/1940873928.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/gusanazodikurixupovig.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/ragexawubasupivex.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/govesexisotelekizevorezu.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/pefokanizopisogi.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b586acf3a---83838801049.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/15602715956.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/niruw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=monogenismo+y+poligenismo+pdfPDF 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_off0000b475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB475 15980 bytes
SHA-256: 9718b5b5f10e6aaf84e91e00ac6394923d8bdd826d801e316e3e07a564f3f96b
font_01_sfnt_off0000dbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF3 10588 bytes
SHA-256: 4acabf54d56af7d671e1584c33162c6dd00e467df0f87cf26f3119dbb0226ac2
font_02_sfnt_off0000f3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1