Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0359a16440bfd8a…

MALICIOUS

PDF

90.3 KB Created: 2021-09-20 20:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5698a50e5f47c7df4548a94b578bd355 SHA-1: 6c66465fd1064df3020ef14f723c2b8881316334 SHA-256: d0359a16440bfd8aecfd8b07a6d55803108adcea8d3d328a45a67be4f706aa3b
172 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to various domains, some of which appear to be compromised WordPress uploads. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to further malicious sites, while the link farm serves to distribute the malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://smidgel.ru/uplcv?utm_term=dragon+ball+z+episode+titles PDF link annotation
    • https://fsbulletsandbrass.com/userfiles/files/seneberisopimogevix.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vomjr9ce1h0jedg2lelciaigr4/wukafojojapudikugugivesa.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/kosiwagetulen.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091417582270.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11272441271.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/ginudizusop.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/62150096185.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/60603008690.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/99660453769.pdfIn PDF document text
    • http://njchemland.com/upload/files/18032241613.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/64834446052.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161305d5ea064e---38437403716.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/37319019874.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/13839632334.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/51585683774.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/balasenozinon.pdfIn PDF document text
    • http://topas.lt/userfiles/file/179711042.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/ruxewusen.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210902035729.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97188549356.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/a6e7e726c3fcd4199c24377de8f9210b/faretadetuwowo.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/33461275400.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/wemoz.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37954785736.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109111549151240.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 24280 bytes
SHA-256: ab968052e3762cd832abe2122e7b42dd88968d53a420e9fa4d69856c3b97303d
font_01_sfnt_off0001228b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA2 10768 bytes
SHA-256: 202a48f023f9f29cc363661dfa3d6d4f2a3ca05e98da309e4197fb1f664ccf0e
font_03_sfnt_off0001530d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1530D 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

Open this report in the interactive analyzer, or submit your own file for analysis.