Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eec020d54219feb…

MALICIOUS

PDF

102.0 KB Created: 2021-08-14 03:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f4b52bfe49b3dd86a67e6ce31a94b3fb SHA-1: d4333919042df14d3c7136fe8dcae9efe03964f9 SHA-256: 8eec020d54219febcc94275eae83a1da34e145e35e6493f41c251181fc8a5a67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, specifically within form upload directories, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607391a76d153---46579269615.pdf In PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609abd1cbef57---jotazu.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/fc270406c68f2f401bf7cdcafc9bb3dd/11279819535.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5d29c95fe---84329818649.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606da3edad57b---74851669246.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/ij1pdsiohoh2h8m7pglkq14vge/wikebokudibuwuxatenajel.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/5081874101.pdfIn PDF document text
    • https://hirurgija.me//files/47235428716.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/6frjqbj29h7l4tnp9keqhoug40/pilifupol.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/memenukabeg.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b603cfd8641---vimimadojik.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/rekuworibowepovej.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/28/file/20210728_022048_163.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/petijemuridixa.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/bakawur.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa07aad182---49476815184.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0c7d192f---20973618056.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8553ad1072---banulefivuxejibejipo.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/4dc316b5b87f23e4d9ccd9f526b5bd95/39648854792.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/hfil9e1rqt1isf9camfkbco3f7/11275116287.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/52734666723.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1627739810.pdfIn PDF document text
    • https://kede.org/userfiles/file/5186565248.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/78taip3gc6ctvacu6uqjqqose7/witedokanaserogome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=escritores+de+la+libertad+resumenPDF 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_off000128fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FB 18528 bytes
SHA-256: 707dd038d9062ef35ad8a0750f6b548a29eee26df8fe0be48bd296c6670fb133
font_01_sfnt_off00015782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15782 10752 bytes
SHA-256: e2eebb80da8631292a7215c6d4e81d53bfc21eac9b4a46570aa7b6dd58d0bd77
font_02_sfnt_off00017033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1