Malicious PDF — malware analysis report

Static analysis result for SHA-256 74436c563859724a…

MALICIOUS

PDF

72.0 KB Created: 2021-07-05 14:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8ccc4526f349ce918aaea7969f7f0a4 SHA-1: 5874a0ad3c64e85fe80e135b9730a517fc024c24 SHA-256: 74436c563859724a01694a7bb957f8555966e523d4f174151b3499ba253986aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous links pointing to compromised CMS uploads and disposable hosting suggests a link farm designed to redirect users to malicious sites. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://goldenpeak.it/userfiles/files/sipolelezijod.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c39a200869---wasepota.pdf
    • https://nevisnews.com/userfiles/63330730210.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/dce484f3c348f52ee0d63a9f9f7f2bb9/20314196151.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/b326f9e126a01c7e55e678a7b481a63e/zugovabobuvojuzebaxukilol.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/o9runhqpv2tt1ea7onpv1tv5so/28567254939.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/39221e4f3119dc63a9316b7abde885ab/72415049472.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983f94e2d23---97986951404.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/cf56bdb70efea85592dcb1f5f5ea62b5/69535405860.pdf
    • http://auto4-spb.ru/public/images/ckfinder/files/gajuwomakuboka.pdf
    • https://cncostruzioni.com/userfiles/file/bipukos.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/cabf126de4f41293749a898cce0adf68/zogulapesitilolarez.pdf
    • http://www.hussco-steel.com/husscofiles/files/16949023129.pdf
    • https://cbdc.co/uploads/ckfinder/userfiles/files/91897976494.pdf
    • http://bkdesign.ee/userfiles/file/sifadoloxabarovivajosijuv.pdf
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/lsbmqesvfqvrjbj5sr705erj81/ketudew.pdf
    • http://abacusnancy.com/userfiles/file/33332922463.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/80f2b76d806a0e96056b74e4934df207/7959775014.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b30ea56790---17586901796.pdf
    • http://acquadiqualita.it/ckfinder/userfiles/files/42791302976.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf903849c8---loxujonabipek.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/de8o3scklmsmga5fmjnah75h6p/bupemogunogir.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abccc18bff6---dawapajizad.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160825404353a0---figulimesawetojub.pdf
    • https://topclassgreenery.nl/images/file/lobilimeweligofi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=rotation+and+revolution+for+class+5
    • 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_off0000bc25.bin
028e876c4d538a156b831b3d95bb092caba85a8198a62233323956953b60c325
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC25 10816 bytes
font_01_sfnt_off0000d547.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD547 16792 bytes
font_02_sfnt_off0000ed59.bin
f0fc3f9ec204c9a38bea8452a3917a99d19a49b5ab7aad25a1ebac233d80094e
pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 14752 bytes