Malicious PDF — malware analysis report

Static analysis result for SHA-256 620f7a0c726a6ce7…

MALICIOUS

PDF

76.8 KB Created: 2021-09-19 08:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ab947dbb34391593cca4c21177a53781 SHA-1: 7893cf2a011fb63e407a603a5a7eb685c67f074e SHA-256: 620f7a0c726a6ce72c70cf113ca63913e46e89020e910c088b6b93db5955696b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://philabc.ru/uplcv?utm_term=stalker+apk+iptv PDF link annotation
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/wujuturaro.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/sutoroxuzipiwir.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161468256d5d89---mimariwoxusefutodupu.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/56d7de90e10c23f9e14ac7b6f6c3fea6/xalenok.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/polaxatem.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/30838486391.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/98575119.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/95462783391.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/tefesegisomada.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613476d9a698b---90122816380.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/65288999731.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/96125382114.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/62320481848.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/mijurevixilefagaxaki.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/69856000634.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/gakivekiw.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/a9a72e4d3c6e8b6e6b5a0e73c27e1e6f/21572581876.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/949a78e4d1f61019f489572465c7afc4/68640144699.pdfIn PDF document text
    • http://imhang.com/fckeditor/userfiles/image/bubotekigaginixojag.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/mumurogutipin.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/95645868774.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/92597010711.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_off0000c911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE123 17512 bytes
SHA-256: ce4ea0c20831061e4f58c24e6ee1e420655fc946012480a8dc80379c6d7c1163
font_02_sfnt_off00010f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2E 10088 bytes
SHA-256: 8156faec505e94da77dbe6e0449c57a38ba44abbe9b6ed3e15b128b714d222b7