Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fcf7db2d9b3bca…

MALICIOUS

PDF

78.3 KB Created: 2021-09-04 17:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4166ad1edb28b099fe1dc4d2583ee27b SHA-1: baaf95dbcbdda1260432c1d9451c28bd5458adbe SHA-256: f4fcf7db2d9b3bcac0f005e8f48cbe13a58c7902abb1a507c6c7aa8907062a84
96 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious and contains numerous embedded URLs. Several heuristics indicate that the PDF functions as a link farm, with many links pointing to disposable hosting or compromised CMS upload storage. The primary purpose appears to be directing users to external malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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://xhzhengli.com/upload/pumumuvugapifofumasemisuv.pdf In PDF document text
    • http://iberia-ex.com/images/blog//file/wuvunem.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c2c883ec7---62605956489.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/boridufumevigekogebomok.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/f63285bba07f8feb89a77cadbafdee12/48290077897.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/pivikolebilogileme.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/72247000649.pdfIn PDF document text
    • http://scoopsites.net/userfiles/file/40860748064.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/4n81sndac03vj81387duh4t1b6/26892597458.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210827094644_nlwze3.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c874c5b7ee4---jokonekenok.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/qclbhnerutrme6p4ed3dfn5vl5/jemakogisuz.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/tubeluruxokodax.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/e776022e4a0168292d3ec02aa44be5b3/legosifitexodod.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/xofimipizizubiju.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/edc4da403ba0ad4cba50bdd6234f9522/dofefeti.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/96442354673.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/hfl6jbq5suap2jo3n8msoa0fdm/senazefupikolokigagu.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072107f4a603---17006810056.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c74c425bd5---tanefoxelupazopo.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927806a990c---83326068362.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/11177722198.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/53669506689.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f7ca4d689c5---gevabore.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/3isl8ogadidln8qupkk2njjjlv/legoxotosowunozokotuga.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/niwawasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=convert+rpt+to+pdf+onlinePDF 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_off0000cda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA1 10260 bytes
SHA-256: 0ab5a47dfa689818e4a52ca55af9b2cf19b5df769bab5b628dc2721106017822
font_01_sfnt_off0000e4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C9 18368 bytes
SHA-256: 98f31e523ca6f6b955805c0abfb22edf0e23cbe11fa2412198dd173642db7017
font_02_sfnt_off000113cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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