Malicious PDF — malware analysis report

Static analysis result for SHA-256 112c5c34d76c4c39…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 03:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 178caaefe614853e2542891d362f3d24 SHA-1: 650cb66d5ed6ac5ca740861e5821803484696166 SHA-256: 112c5c34d76c4c39ef781d341660a78e21d6df7ac7b9dc145377254f2514b2d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified it as a link farm on disposable hosting and pointing to compromised CMS upload storage, suggesting a phishing or malware distribution lure. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=mtk6750+10+core PDF link annotation
    • https://www.hkha.org/ckfinder/userfiles/files/kafedebapova.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/49064638768.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613516fc2654f---67269004454.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bec368c6f---tapawatomujudexutumut.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/86989019482.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/bikaxuxevujatosokisi.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/34678283291.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/78117371141.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/tvejlpmqurne5o7eiksnm8luuj/46253782852.pdfIn PDF document text
    • https://onwater.my/uploads/file/gekelamavixademije.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/56182962211.pdfIn PDF document text
    • http://coachhouse.info/assets/file/89549926970.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/75333578311.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/38795942503.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/38686845486.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/wusukejoperofusolapej.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/7447816360.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/27949547458.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/6261950118.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210911_93E9B5239FBC2BD8.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/lejeguzovezixelenotazof.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/54625517249.pdfIn PDF document text
    • https://majubesar.org/contents/files/vojiwukib.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_off0000d79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79F 10264 bytes
SHA-256: 8beb6fa7a7e6c89b9d28a31250249303a23aff8853476304836240b86ff4ae66
font_01_sfnt_off0000eefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFB 17972 bytes
SHA-256: 11315107ceb23d258ec47a5128d0b9354d18469db0dca16bf43b36a1dc9c8377
font_02_sfnt_off00011db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1