Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c0f2b43e9c5197…

MALICIOUS

PDF

73.6 KB Created: 2021-06-11 09:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a164c2b98545f28a9a2385be9e9e0af6 SHA-1: 2e5712cdad3f885d429183cc3ca37fbe0b5d2f50 SHA-256: 88c0f2b43e9c51972a139b2b657937a7c6b377a30c1a6ff772b51b12d5449744
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

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://drafthe.ru/uplcv?utm_term=minecraft+mod+fnaf+universe
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160737f2e6fe2c---91630962990.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/f00cb493304cd9946c97e440fa6bec8f/fuvilebawiwomirilisezev.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0f4f08735---25824563053.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/mhcfp2pnels0idp86oesc71gbk/7561271398.pdf
    • https://okud-istra.hr/userfiles/file/19246786537.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16080ccaa3fecc---69777125529.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/2k7jmbsccak8bubotiq905h1nr/lesobo.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5830bb2e67---4749440916.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/561062f2ef1c16b0523bca9805a39eb2/43084174140.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608f64116f319---gudixewubelixibijutar.pdf
    • http://monkey-do.net/userfiles/file/94976651365.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/sirkh1n75u8dppm9k198ocmkth/43583150917.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828a8fc53a2---nurorigupowupewati.pdf
    • http://frezerovka.by/images/fxeditor/file/40761130050.pdf
    • http://riskhedgetech.com/uploaded/file/101174987660ac684510d04.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_off0000cf48.bin
0eae3f8056bcf8d557086d8be4d122fd35c7b3328781f6f3b1969dbf28b8dbe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF48 5200 bytes
font_01_sfnt_off0000e0f8.bin
97f12e835ccbd8da28058056c264c362281bce7e37b06134c5166a431ff7c959		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F8 10736 bytes
font_02_sfnt_off000105b0.bin
b2cf57f29eb3b5e0c174876c58b70ef8fadd81916e6e05a17acc225f9629e7e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105B0 16064 bytes

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