Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13506a4a512bfc0…

MALICIOUS

PDF

78.6 KB Created: 2021-06-16 18:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 248708dec1b359e94af62c02271738ad SHA-1: 74ae23935917e5200a403aadcf01b5eb460b8c8b SHA-256: d13506a4a512bfc055bd8a0b6695d10fb8b7edb09888fd35b9ae87263313c168
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites. The primary URL, 'https://chcial.ru/uplcv?utm_term=african+queen+2face+mp3', suggests a potential lure related to media content, possibly to disguise a phishing or malware delivery attempt. No scripts were extracted, but the extensive use of link farms indicates a strong intent to redirect users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=african+queen+2face+mp3
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607540f2076c8---mimaluju.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607262ded4d1c---75752290117.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609962ce0fa46---63518727095.pdf
    • http://pphu-joanna.pl/fckpliki/file/rewakitamuxidumigezav.pdf
    • http://pogservice.ru/userfiles/file/25485491623.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/a51b38ab1e26f265baf7a5075b51c941/dugeliwuzarewezimef.pdf
    • https://ubranni.com/uploader/files/88103559743.pdf
    • http://tantusmarina.com/UserFiles/file/guvoki.pdf
    • http://accessiblevehicleservices.com/userfiles/file/42470516978.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a79b01cd7ab---fejodatapojat.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c5ba4effe---69266949354.pdf
    • http://adria-ex.com/images/blog//file/96551093989.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7b476fe85---dulajitizufijewebatebo.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/clguf9tlquuilstp13keoecim1/likebanosu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcea.bin
223161ef1e2e040c32d6a8f69a5ec4f1fa445b94790a49ee32dff932b972d8e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEA 5360 bytes
font_01_sfnt_off0000ef23.bin
acdebe36f188bcfd2b5208f174af2cc566ee646395a16117b78671b8ab627ad3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF23 11964 bytes
font_02_sfnt_off000117f5.bin
c5b81f703ebddc697e6824868dcd306aba919aa4c1ec28f594a83a04df97872b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117F5 16144 bytes

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