Malicious PDF — malware analysis report

Static analysis result for SHA-256 1020e45bd736f2b9…

MALICIOUS

PDF

65.3 KB Created: 2021-06-03 00:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c170c9b3572c611e2a05f5c65efde10b SHA-1: b731e063810a108c9ff51e87d1a395fac5c39728 SHA-256: 1020e45bd736f2b99016e1291a65cdc83e2a06f4a4b1618b85e4aec0a56fb350
154 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content. The presence of a URL with 'utm_term=download' further indicates a lure for users to download files. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly support its malicious nature. No scripts were extracted, but the overall structure and URL targets are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9776

Heuristics 5

  • 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
  • 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://medvor.ru/uplcv?utm_term=download+tabs+totally+accurate+battle+simulator+for+android+mod
    • http://fluidearthconcrete.com/userfiles/file/tuvuwerixusasa.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/98625129740.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8cdc33a9ac8806b36ee295a0f3ab0c9a/38009186257.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4c1d83cec---xabovudi.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/ks2jsha9e9h468p0m2u8lr0b87/gerexixakifatikijutokubi.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cd2f466c2---fesibinofivonowokazukaro.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdaf9d642c---76216170925.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1ff845b11---memedurunaga.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4e9882cd---nosuxu.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080f8beb328d---33485302533.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f1df37665---6745126635.pdf
    • http://cayxaotamphan.net/userfiles/image/file/waposisofa.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe72a50f5e---kitoxisotonuwapufisumidex.pdf
    • http://mousike.it/img_ins/files/11783336402.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607053c6d891b---dijexededapubuvijujuf.pdf
    • https://calmoinc.com/upload/editor/file/vakapudakap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d97c.bin
aa304516aa5a711c84079a9e2678f4946c03cc80cd39299c21e6f5be8c26ccd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD97C 5384 bytes

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