Malicious PDF — malware analysis report

Static analysis result for SHA-256 179384ff6f48ac1d…

MALICIOUS

PDF

87.5 KB Created: 2021-09-05 08:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b9e6c2136eb5a01d52f760ca0179197 SHA-1: 3aac003c5f4b9e0a34aeca2e570ca38b024d0db1 SHA-256: 179384ff6f48ac1d7734702ff0cffe2a44b49a7b253d05ecef34022666665279
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 and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other unknown domains, suggesting it functions as a link farm to distribute malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abe8d9947e---ridobuxasutifa.pdf In PDF document text
    • https://songod.vn/uploads/image/files/razabelaka.pdfIn PDF document text
    • https://betibg.eu/webroot/img/files/forofewonu.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/misejekokipojigexop.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b0493cf18---47298012853.pdfIn PDF document text
    • http://adveotec.com/img/file/15593940584.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74b55dc457---58099576187.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/bisexi.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/93351303117.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a1c72a755aca2d7b69aaa6a48cf7687f/15907982016.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/sanasufamajojijefifasetit.pdfIn PDF document text
    • https://dm288.com/slicice/file/21627427337.pdfIn PDF document text
    • https://artenika.pl/fck/file/tabijubi.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02f66c2315---82737098558.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/bowonepiweloriwetin.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/26lt7hepg033itvofj4muh99se/97172283314.pdfIn PDF document text
    • http://landpas.pl/upload/file/45937199304.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/df359e7edb3654981de565445fcea7a2/89559923001.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/vugifisuji.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/5c7eece303d406e157d56d1bf8f5a658/pijegadizomeduvamominatub.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/velepizabogupofefivusotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=national+education+policy+2019+pakistan+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_off0000eb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10369 19752 bytes
SHA-256: d413733709ebd7a9435a3db1267e76a9269a15661fb247a9028ad32fbad3f031
font_02_sfnt_off0001353a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353A 11260 bytes
SHA-256: 75c2c06f05dbd3b4057ca0b98f0a21eaaec525ecf33702c95edf3f55fc2139ec

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