Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e85a2d3b9ff022…

MALICIOUS

PDF

79.8 KB Created: 2021-09-02 06:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3309f0dbf09a2f23ebb86562fc148dcb SHA-1: 8f14204f9e4b876773bf1dd93484a3fb1f82bc31 SHA-256: a4e85a2d3b9ff0222c564c63198a016f1c7654b6714a1aa229ce5a57b7f98c8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs indicates an attempt to lure users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://archism.ru/uplcv?utm_term=dc+pandey+physics+solutions PDF link annotation
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d76c18789---dazevoserabusubufufuma.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/c6f82480d1dc8ce43e877ee705b0110d/xixaxapamapuno.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/c7a34dbc974fd7addbd2a0f0b27a2f3b/gevaderimopexatuna.pdfIn PDF document text
    • http://air-con.ru/upload/files/58918091431.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071879a30764---zilatirotewudoweti.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114594264454---48690383040.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//93299862714.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/85071827496.pdfIn PDF document text
    • https://razredna-nastava.net/files/12444112032.pdfIn PDF document text
    • http://debden.org/userfiles/file/55486277356.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1406081623612629375215e.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/rarukikerosopizoziwig.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/99789703928.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/duwitewelefuxu.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/58371194478.pdfIn PDF document text
    • http://anjingliar2.com/contents//files/19898547168.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/mivawe.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161101167ca520---81071069600.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/wobigijelitowetasoliv.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/wufekanex.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210715_030104.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/77515745789.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/zevifod.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_off0000d2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F0 10724 bytes
SHA-256: 2f1ecef57881f70f4ab0c552f1366a6f71dc68352aba453036593479c361bc9b
font_01_sfnt_off0000eb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8F 17596 bytes
SHA-256: 9c79c53a968658cf85f88ac1ff67c2c583fb54ec9e559e64e847cb90c1c801ca
font_02_sfnt_off000118c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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