Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a11a24ebf4b115b…

MALICIOUS

PDF

80.4 KB Created: 2021-09-23 19:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 32c9e238a441b65c204ef0ab480d0685 SHA-1: e7625251ed1312c235164cd9ec4bf094f4c1aaf9 SHA-256: 3a11a24ebf4b115b1f333a0c210b8b9cd3307a7770c2789c6ab87a1ddd0ec6d2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains or compromised WordPress uploads, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or malware distribution attempt. While no scripts were explicitly extracted, the malformed stream length and ML classifier output suggest exploit activity within the PDF structure, likely leading to a download or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://nomylo.ru/uplcv?utm_term=game+horor+android+paling+menyeramkan PDF link annotation
    • http://ulv-fogger.es/d/files/mujolalejerotutiletesi.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/11056306342.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/312772127.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/tijedisimuxufebitale.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/78246165860.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/96863305498.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/patasixalukovi.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/95232595662.pdfIn PDF document text
    • http://ducnhua.com/upload/files/97908284344.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/65894662506.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/cbad14d45846fb66823cac4b84e09a2e/8704444180.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/19381732517.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161416e32116e8---11561148200.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/33779661012.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/53115502149.pdfIn PDF document text
    • http://ridendo.cz/files/file/vowukax.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/bataxazusinirefuku.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/77356691729.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161400a63c72a8---83276342520.pdfIn PDF document text
    • http://adfaveo.com/image/files/20210921_212943.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/vojejezobuxedunerevisozaw.pdfIn PDF document text
    • http://linza-market.ru/upload/files/12445992827.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/kinojeg.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/rapanojototutikozuwasajev.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/80675036279.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/75266678985.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_off0000d718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD718 10816 bytes
SHA-256: eef7672660632ed2976d2ef556a6531aded93f46ad3176a4c65fe915c510a839
font_01_sfnt_off0000ef8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 16992 bytes
SHA-256: 20167122f5f923369b46e2154ea0d41b9f7f27873a7571f0c3897ee56961f348
font_02_sfnt_off00011bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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