Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd557d4407c07a4…

MALICIOUS

PDF

87.0 KB Created: 2021-09-17 09:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fef3be2010a522ee3cb4ad334da66910 SHA-1: 47d330d00411700f0238481fcfbce0ae303674d7 SHA-256: 3bd557d4407c07a4ff4cd690fb9c0577d99ab6eb1bfe64287d551750e50b0e97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://viettincapital.vn/upload/files/mepotalatubasi.pdf In PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/dopudev.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/62049133552.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210901233819.pdfIn PDF document text
    • http://archive-2014.humandoc.pl/attachments/file/binagipegazamoxanulef.pdfIn PDF document text
    • https://webrobogo.hu/kepek/40006372514.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/80067099730.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614416dd1bf26---waboguxig.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/zigogaki.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/jexoxudi.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/tenewip.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/21316645086.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141e07b6b412---wigevemeruxozarim.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210909_9FA09CFE498640A9.pdfIn PDF document text
    • https://led7.ru/file/87675016346.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161390a92eeb21---gopirirolajaxowux.pdfIn PDF document text
    • http://davcpundri.com/css/file/1007546866.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/47753377957.pdfIn PDF document text
    • https://sambelteri.com/contents/files/zoseraxeneranopozimoj.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/tadafitejovosabo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136a901a6968---47371579191.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210901083638_512207911.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/27174741293.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/norisideguluvumuto.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/tilutu.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/diferijepederukij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=v+bucks+code+free+2021PDF 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_off0000ef06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF06 18096 bytes
SHA-256: 25674623cb7dc160c5b54676cad05a47983d662d5ef66bcc93cb211c5b957b93
font_01_sfnt_off00011dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEE 10564 bytes
SHA-256: 8c49ba4693523866580c422abb068c2d06ecc9a5161d4816d8175bf4d4643398
font_02_sfnt_off00013647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1