Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7c5f5c1a766526…

MALICIOUS

PDF

71.3 KB Created: 2021-09-20 09:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 279d3c7e8214678905b0d1445db307df SHA-1: b868757516f0760462559bb5195e52a7a0732304 SHA-256: 8c7c5f5c1a766526b8fe5636cbee51f24ed2821d4c7b99db8f602ad1701a04f8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of multiple links and the nature of the hosting suggest an attempt to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://nakatarikaszel.pl/app/webroot/userfiles/file/xuzozibatukeduzuzuri.pdf
    • https://rt-totaalafbouw.nl/userfiles/file/fapasurivirogupezidoguril.pdf
    • http://eqletstalk.com/uploads/files/202109110814126769.pdf
    • https://wedding-photos.cz/userfiles/file/nupopu.pdf
    • http://opuspoint.com/ckfinder/userfiles/files/wibososiverovubuketixumo.pdf
    • http://darslaska.org/ckfinder/userfiles/files/nubudamakikokunekarivek.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613607313ec9d---virafagu.pdf
    • https://arerp.kr/data/file///semarutoxesutidi.pdf
    • http://narnivet.com/userfiles/files/78971534839.pdf
    • http://cuacuongiare.vn/upload/files/38534139628.pdf
    • https://777mto.info/contents/files/tetafefutaluropajiwagodu.pdf
    • http://thietbiytedaibao.com/media/files/28620330332.pdf
    • http://gusanhightec.com/userData/board/file/foxazapezatajov.pdf
    • http://tcsklife.com/filespath/files/20210916000933.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/rn0qmk73bkfim81rc7v45iq8f0/86653868781.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613615089d857---wamodofujaponufiw.pdf
    • https://jotekonybakterium.hu/userfiles/files/26826164274.pdf
    • https://bientannamhuy.com/wp-content/uploads/files/batuvaromigawilum.pdf
    • http://www.europesolidaire.eu/userfiles/files/tegevesipimijugetafegaji.pdf
    • https://laptoptranganh.com/data/dulieu/files/19584503027.pdf
    • http://csc0311.com/userfiles/file/20210906050949_fv2v5x.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=showbox+free+movie+app+download+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B1 16792 bytes
font_01_sfnt_off0000ccc8.bin
5188a3e4326f6c21418eb08b1f38988e10d573069cdb3a5e4827d71a83d1cae1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC8 10964 bytes
font_02_sfnt_off0000e5de.bin
326c42d9fed96eb75aa8d0693c12d4584c977d8eb42192ded2a6a5c733a0a241		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DE 16472 bytes

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