Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa49f98aa776c3d…

MALICIOUS

PDF

79.9 KB Created: 2021-10-16 16:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0f53254cfa1cbe763550163c79b920c6 SHA-1: b630de29e68c889101c58230b09593566dde72a5 SHA-256: 2fa49f98aa776c3daf4494761b328d108defc13369c786a27be1a2c8de6f7e8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other potentially malicious sites. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to deliver a second-stage payload or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16158664f23869---43490387211.pdf In PDF document text
    • http://charolais-hessen.de/write/userfiles/file/liviwebepuwifimasulofe.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/kifewo.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/gawajipuzagasopokuwo.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141b7ab00bed---vegasedatuxazuromir.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/21035840723.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/721tr7amvon9t77dgq00j8e8l8/wedapizogavisil.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/27141648890.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/jelafiwa.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/xifitijuwulominegabapi.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/14032693154.pdfIn PDF document text
    • http://ban-mat-canh-kinh.theonejsc.com/userfiles/file/selokos.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/49643745135.pdfIn PDF document text
    • http://iphysiology.ru/upload/jutunokozi.pdfIn PDF document text
    • https://sme.bankai.lv/ckfinder/userfiles/files/74326971483.pdfIn PDF document text
    • http://samtekelektrik.com/files/44389345599.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fac1185ab---60284638599.pdfIn PDF document text
    • https://ckmandarin.com/uploads/gajibetasewugodulidexetod.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/gubexuronewab.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/takajosepozugegaduwog.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/8199043460.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/44626338050.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/sozalevokadujalivarejud.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613383b35b4b9---razabanivemetojanamoba.pdfIn PDF document text
    • http://df-2.de/images/daten/file/sujolufekumof.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/13591911448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/vItLtdF7Pec/uplcv?utm_term=red+vented+bulbul+for+salePDF link annotation
    • 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_off0000d34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34F 17712 bytes
SHA-256: 6e33188b205d11aad9d73dac6cb45fbf64768e4391a74c3f6b32fcb2ff9e79de
font_01_sfnt_off0001019e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B5 10608 bytes
SHA-256: 3baaf740b0857eb93e11090b483a51c5dfa15736bedfa8fb786b4bd925816f59

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