Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9d38247d0c938b…

MALICIOUS

PDF

72.6 KB Created: 2021-09-12 20:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d9cdd12d306753753b587b8006dbc4eb SHA-1: 63bd53195675f7eb9ca3089a303f73e88bfff6b2 SHA-256: de9d38247d0c938bf6333595fb1c1d61f6783beea6fb05b678aa9c3562fcb42d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised WordPress sites or disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather for exploitation or redirection. No scripts were extracted, but the presence of multiple external links and the ML/ClamAV detections strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://hoteldanang.com/uploads/images/files/17973181824.pdf In PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/vevesisozuged.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/24710203371.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/13801162990.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/linolimatidalilefa.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/bizanoronitakele.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/e2ro7l5megsm91oibilkk81l6d/ruwogeloz.pdfIn PDF document text
    • http://xprchemical.com/upload/files/74064743818.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/20166711704.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/51674356794.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/96687110094.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/9b0c28425826238afc003af1906bfd54/14393475485.pdfIn PDF document text
    • https://tuinvandecruys.be/file/10519448492.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/40146934503.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/nuraboxariguwokunajaku.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/27796184752.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/63708113293.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109032253352096.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/rumonimekekisunew.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/17554314980.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a059c1c888---27365160875.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109011518259261.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/sewenibugizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=4d+parallax+wallpaper+iphonePDF 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_off0000b98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19F 17256 bytes
SHA-256: 2cf288272db36aeffc4695a5da9ae7237baba1c93286cc3321f4c5dd523d2fe9
font_02_sfnt_off0000fdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB8 10392 bytes
SHA-256: ec8e76ae5f350ffaded59b93bccb08079f44234d08f54e459543533445916d51

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