Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0824773b1f8b5c5…

MALICIOUS

PDF

115.1 KB Created: 2021-06-28 01:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b32ecbb1becc916984ed0ec183ba119f SHA-1: 86f258e82d4dac8895d09b76fd810c5616d09d71 SHA-256: e0824773b1f8b5c5bb1ec25f52f652db1d6186c4dcd2c2a711f778bfe12bdffb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories, likely serving as a distribution point for further malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793e9a2bf55---rikizikexekalab.pdf In PDF document text
    • https://weeb.nu/userfiles/file/85984918354.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/60b6a9b507e2fc16ccf6e51eb0226f4a/75610435066.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/93d55d008ee3dbad6820b12db4e9f1e6/37296575887.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d21546dd88---65526249889.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/fegazujigobefitijiguwu.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/8737338009.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/57ad251531538a720f09a6120357684a/seliwotofip.pdfIn PDF document text
    • https://edarky.net/data/file/6651805247.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fd1167331---86585946416.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/44568612644.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093bea1e6c3f---16990295126.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/5bebb1453bdca1b0920b035082591d98/fufogipixofozuwinasul.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/80454465212.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/4a21c2c376a48e920f519ed0184e2b2f/79477927346.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/zomodavizoxor.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c38bb85ea0---pavexumepinalodewenoruvo.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/759c9dc3098cf50462e0e10e542a8eb9/2311050938.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/47521083409.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089384272b3d---sunazugaserorigak.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/tagirojinusotafuzugida.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/46qc8f0idloiqome4tmnojfto4/lenuvuxuxabarasovi.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/b3d99d8bbf78296943c15617394d57aa/34521000363.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/9mfv7ubboaqttmkqnvev6sefef/65084612232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=vegetation+of+tropical+evergreen+forestPDF 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_off00015f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F61 18080 bytes
SHA-256: 788f43f9fbc9bb9dc84680975bd05d0ec834e2b6eb9aafd0afe9f366633e036a
font_01_sfnt_off00018e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E0D 10688 bytes
SHA-256: 8ce703c2e3feda62d35932022cfdf8624145544b4f6fd34229662526afea2ecc
font_02_sfnt_off0001a6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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