Malicious PDF — malware analysis report

Static analysis result for SHA-256 df34eb993cc00a8c…

MALICIOUS

PDF

85.5 KB Created: 2021-09-17 20:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c1b6ef6b256a4aceccfb7f9a59a816e9 SHA-1: 125a972c92310c2b306e8e569048e2edecbffe6f SHA-256: df34eb993cc00a8cd36e2413f7513cd51fb3a3623208455ef4019c40834d0166
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple domains, including compromised CMS uploads, suggesting an attempt to distribute malicious content or engage in SEO poisoning. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nhadep30giay.com/uploads/image/files/18169901266.pdf In PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441772686d7---zixunixokajijotanubega.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/10529332328.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/gemefonexufewumarux.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/flimer18ou2k42hehl01jt78bf/vazagopenonoligevogimelot.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/tusomifufuxolotifoxaxa.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/18970508314.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/sozubebowik.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/vsa4etokut3gjjh20aiao8esjb/dutunorudejuwijame.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/sifububilegubijum.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/31386670587.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/jazuru.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/wexegabulemesigukelafub.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/69541765001.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/69940062446.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136338a217ad---32750259252.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/52807277166.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/saxakoziluvaneje.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/20140808045.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/xisavuzipibotireruz.pdfIn PDF document text
    • http://skupka54.ru/upload/m/wuranedubuvozamarirowote.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/39263573645.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/3f9d7c9ddc259e90271d8043b315fac6/mujikusaligogipame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=fabulous+daily+motivation+and+habit+tracker+apkPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/pawatogeleruze.pdfIn PDF document text
    • 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_off0000e082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE082 20528 bytes
SHA-256: e99f5c6c2a4d67f91e15f8c507a2e590a035e98289160eb7f2eb51c090c942c9
font_01_sfnt_off000115c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDC 11268 bytes
SHA-256: 74734b6eccaf64c8a87f62bc7ab3560cd92ce371254f43d7b746782989d893dd

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