Malicious PDF — malware analysis report

Static analysis result for SHA-256 9352d44967432275…

MALICIOUS

PDF

104.8 KB Created: 2021-07-24 12:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 96a7d807eccce2c8a3a495275e1882cc SHA-1: 293c8a4367758063bef7d517c181f5f107dd3859 SHA-256: 9352d44967432275af000e89df12b95aa288a561aa0760d600d00e8cfdfb11c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links on potentially compromised sites strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16081946ab0ac8---31733422125.pdf In PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/18151925884.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/20jkrodqbevfn9d93mlimhu7v7/74338305511.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f0ebf1103---xilijigegepulisajimebumav.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/5358743464.pdfIn PDF document text
    • https://vestol.bg/files/file/81874962116.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/jawerovosekive.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/0pofpmb7fum1eavjk1vcd2dnpj/39354154863.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/tizuvomer.pdfIn PDF document text
    • https://akemi.ro/hirek/file/noxojidozevipipotewex.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873a9114b91---wumawejo.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/fuwoxekenugajuzulipiz.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/fcdcb7cb10a4850bd836547d86d27f6e/xubezanewegadikeg.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8c62452c478a25bfbb5be9cd612872fc/88253977898.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/47169310496.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/17571391030.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/30828578990.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/taludamavanogodozubupaf.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/35708025570.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/gg8ibmfes5us327n9j9j2atkg3/10612046435.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/18c5e4823eeebd3c567f47ae6dc0a1bc/10278628793.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/79858049533.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-8/20210708012011975786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=types+of+e+commerce+with+examples+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_off00013451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13451 17648 bytes
SHA-256: f64346e807e62bbbd0ec33bb9a80904bac698f82f1ea26b88348dc09415bbee6
font_01_sfnt_off0001622d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1622D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A44 11048 bytes
SHA-256: 05cdcc77300b4b939ee96d2cb067a2d3aa9683f5b47f6ec4a56f0efc8c578e19

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