Malicious PDF — malware analysis report

Static analysis result for SHA-256 33035c2bb61fb16c…

MALICIOUS

PDF

93.4 KB Created: 2021-09-02 02:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c307496d2bdb920a88170f925bfad2da SHA-1: d00a234e21cb76ea31b52b4124b17e317a427461 SHA-256: 33035c2bb61fb16c9c72b9d37cfd5a31a17c56bc815f4e1ad01b6418fc915d6c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82cf3cafcb---8719801367.pdf In PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608212169eb78---32390709133.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/38876236342.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202108220546013096.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/jamidapodolilitelufinowak.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/bewowivip.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b453133f57---92924065563.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/20240955213.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/7959489728.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/310916834f4008cadcb096991f94ea9f/31353785678.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160f3b7d586dc2---91610563502.pdfIn PDF document text
    • https://marigabung.com/contents//files/28365598287.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/12427313161.pdfIn PDF document text
    • https://lorus.rs/files/zatozugefojuzi.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/zedizobomenoxuvolimaxizad.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16094521ed5c8f---xoxinumanamarodene.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/93925959370d02e26aff9e42d54ccdf9/51259566327.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/44773751360.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfa3095856---91063114967.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210722020908.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607339a146752---zadovodetatanuxajuboluja.pdfIn PDF document text
    • https://udruga-invalida.hr/files/vumap.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/971328561d14fc37e21a571ffeab2a82/25426244587.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210507092549558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=139+days+afterPDF 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_off00010b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12360 10392 bytes
SHA-256: b3cf4d0346775e5db8dd3b923271010787f770766fe240f5aefe93ef7327dccd
font_02_sfnt_off00013b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B13 17192 bytes
SHA-256: 0d837e87597fe1c982e687b4a6768723b2038867adbe6b7cc885b96a502498c7

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