Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ed856a17ad4356…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 08:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a23c2e4f749fee472f3d781dee7cc567 SHA-1: dc62a85f6cf42b07f25c34965bdb912974698c99 SHA-256: e5ed856a17ad4356e16c87651fc65887bfbc2c29a6465e3d40949343479e886b
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary attack pattern involves directing users to these compromised URLs, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://gilboamedia.com/userfiles/file/36078684584.pdf In PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/nikegipijojize.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bc2ccf9d4---525394722.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/lavibodatomibesejud.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c157f68137d---11700530274.pdfIn PDF document text
    • https://asiabiru.com/contents//files/32346679588.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/kuzuka.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/66576289861.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/34869963100.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ch8o775c2g2j7cmg7fh706c5n6/widugipipabi.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/53849392862.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/midopiberi.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/xunasoxibirez.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/xirotidotu.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/52042756634.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/44928831256.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136aba40293a---gulumufodabetudagefunetif.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd29089ce9---nixodogu.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/2f445e35513ab0f830380b0f247d8d42/21510888894.pdfIn PDF document text
    • https://linker.tw/files/28057398823.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/48217848843.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/75929738619.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/d1c8ae37cc543503e26a9609b395d5ad/9565891440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=blackboard+collaborate+tutorial+pdfPDF 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_off0000d7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FE 17984 bytes
SHA-256: e740d95e892313f93f07dac2d6e45a2de72135160c0aa2973dce32470279003e
font_01_sfnt_off0001068b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA2 10724 bytes
SHA-256: 5f47fe86b0025c938e234a73ace87908962c7ddde59bb1de34da3867ae50cbb9

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