Malicious PDF — malware analysis report

Static analysis result for SHA-256 16dbd94dfedd62d3…

MALICIOUS

PDF

76.9 KB Created: 2021-09-06 20:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9e06df6fe5e24aeba3c1ca52af03ea31 SHA-1: 7b596b92b4b6ff9501bfa31b8c3cb0e7ae5dd943 SHA-256: 16dbd94dfedd62d30f0d8da36d4b5ef8ae73c3fc1731bb630eef529bd83e843e
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many hosted on compromised CMS upload directories, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers strongly indicate maliciousness, and the structure suggests it's designed to lure users to external sites. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sjzhtchem.com/upload/files/tulog.pdf In PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aac8e40c0e5---61951374458.pdfIn PDF document text
    • http://rotang.net/userfiles/file/18434794580.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/58527426297.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/259870109.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/didawelu.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/a60dbf7dab95313fa484418a5bd9d331/nubufavinugit.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9rhsgeda7jc14eflvkc6qtrm20/mutarupotadujuzites.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/vigatupotarizilamunigikab.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/af19f77f14aa81f6ba1865f75690d7c3/zitivape.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/tosur.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/busuli.pdfIn PDF document text
    • https://medius.sk/userfiles/file/9593798316.pdfIn PDF document text
    • http://zzweien.com/d/files/libipavege.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/76401688819.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d19f010607---35391427072.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/35350691559.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16111cdaed3cdd---revogaxe.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/womupazatifi.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/tudanewomotufakowuzezab.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/xonilubigilakisodul.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607177c21a9a7---24076861970.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4d95058e6b93841ab6606c2a319ac73e/76135498149.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a2586be920f---lolefirirajidejeruro.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/2693479731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=logitech+unifying+keyboard+manualPDF 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_off0000c932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC932 16572 bytes
SHA-256: e415a1f1310a5dfed6e5d4fa63874093a13cc7ba7f032e89eb2331ae692b0bb1
font_01_sfnt_off0000f427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3E 11156 bytes
SHA-256: 61b13febf105b433b6b80077d0f24bf4b78827adff45b74080da7d9377b541fe

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