Malicious PDF — malware analysis report

Static analysis result for SHA-256 de48efb7954b1384…

MALICIOUS

PDF

85.5 KB Created: 2021-09-16 18:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eb6078eb4cd62964d1dd59bc8478ffa7 SHA-1: aa45d83dd1cf8a2c241afbe95e606a372f64491e SHA-256: de48efb7954b1384fe472528f94a19d66541db81eae0b38fc5626719b7ee1925
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports this, implying a lure to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://casalindasbakery.com/ckfinder/userfiles/files/lelikosekurujenexofafur.pdf In PDF document text
    • http://simkoongschool.com/uploads/editer/files/82969191510.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/60365860006.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/fidupurorupu.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9d802161e4a8edf4d8b01144d5aa233d/kilubupozidipujuline.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/jejimelosugiduvi.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/bonexikulukatazurunixom.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ca3d62108---60511582458.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/16746892797.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/nikib.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090419075932.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/70553887616.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/ziwujila.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/15184166857.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/62005171797.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/86110722274.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210910093457187973bzfi2.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/palofowiboluzesi.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139c5491858c---xiguk.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/3a95af2ea867b6d7e56f534b2b035fba/5020317594.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/makawitumi.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/dajujazobekupo.pdfIn PDF document text
    • https://umutfm.com/resimler/files/domal.pdfIn PDF document text
    • http://bdnchem.com/upload/files/64765873788.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/7806829680.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/s03s9lhp1s99mdiighn7rg6m35/vexoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=hobbs+and+shaw+full+movie+hd+downloadPDF 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_off0000ea1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1C 17448 bytes
SHA-256: 130157662534efae5c910f4c0a33424d8bd95eb908bae85c6ae0d143c4b3ef4e
font_01_sfnt_off0001172e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172E 10804 bytes
SHA-256: 6c9187966773fa4e8905ad4ae432f0961b636615deabbba488f46a32526fdb6f
font_02_sfnt_off00012fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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