Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c801e28427966d…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 04:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 65a836432d3ff7b5a19d69c083143d31 SHA-1: 91d0b243cbcaf156e74a45e322e7a68ed5bdc3e0 SHA-256: 23c801e28427966df2c21ac1c6f03aef46977913030787aeb641e12bbe2d1ffa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised CMS uploads or disposable domains. The primary intent appears to be directing users to potentially malicious websites for phishing or malware distribution, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://buydecor.ru/uploads/files/tawebixotopiwituxunuv.pdf In PDF document text
    • http://aeronautike.com/userfiles/file/kumawixakisakirokamex.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/376325241029859894953723ae2a3521/19434867942.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/89059878733.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/65064380256.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/059055de3aee42ed210c67bc2bc9ddae/68879655268.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/72ee67d4474687d6bcaf49a5ceb9813b/15210809431.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/60607882648.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/wanoxo.pdfIn PDF document text
    • http://airsoft1.ro/files/file/judubenaxazoji.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f282a81335---mibuj.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/fapatisupuwotojevakogiz.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/wifuvoforulawiremovuj.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-6/20210506093637197508.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612677f092f07---26668226875.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbd2a34014---9970675988.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/29468910735.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c32a627022fe3004771b2d25e38c77e3/18360733228.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/5c8359cf128e0579506bd26ba2014042/lapamumivopofatixezewoje.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077463be0f0f---84248493734.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/87288499654.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e336e2367d1---6886576769.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/webexaxedigugi.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/13313372344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=definition+of+evaluation+in+education+by+different+authors+pdfPDF 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_off0000d8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D1 17504 bytes
SHA-256: e48c1817f4da20f41ff1e56dab074b1051767af401152e4dc15abe694ef13abe
font_01_sfnt_off00010618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2F 11136 bytes
SHA-256: ce9731cbc71cbbc43427f16f6e9426644415e275791d11225dcb654e824b8ad0

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