Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb5fdcd9159e2c35…

MALICIOUS

PDF

89.0 KB Created: 2021-09-20 21:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5c09734babc5fab783bf48b1961835c8 SHA-1: 408bafe1634b2b920b66d2b6eef50e3d7abe2aff SHA-256: eb5fdcd9159e2c35806bf598ae9bba24962cba40c52eac1a4ddd325c926e6f9f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, serving as a lure for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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.
  • 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://mabifitness.it/userfiles/files/kunixemupemazokago.pdf In PDF document text
    • https://itandem.net/ckfinder/userfiles/files/tivavaxifage.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/92826940001.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/numobagifi.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/pibatediwabug.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/zudixapumorozod.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/73179602109.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135e4370a212---wuzotakojatolebopivoraz.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/vezulowupivorexikise.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5c62789227bdab1d7c4faf2c08a580eb/towupefuwofotelokeban.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/32685098994.pdfIn PDF document text
    • http://cartopack.com/Images/file/gofawobarap.pdfIn PDF document text
    • http://uhorder.com/upload/files/kupikojez.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/muvotigut.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/47671843385.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20219152255474148.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/77282018189.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/59495629641.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/salizesoruxizovewetexox.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/82817319204.pdfIn PDF document text
    • http://turatabor.hu/media/mipubamalobe.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/23c0f4c0a0a9facb105a5aae53413432/42103154547.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/21403754166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=watch+oldboy+korean+movie+online+freePDF 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_off0000f7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 17596 bytes
SHA-256: 365a464e6e61aa44306803f0d44eb57b5557e3da4133dc3fe9965d4ca6983a1b
font_01_sfnt_off000124de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DE 10980 bytes
SHA-256: ba59b5775f336380c6a018f15637e25c30ba3c67765688a5967744b32deba01b
font_02_sfnt_off00013e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1