Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9433e55b270d12…

MALICIOUS

PDF

81.8 KB Created: 2021-09-24 07:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f189835c0d0b0820d1b024604a401ada SHA-1: db6cfdce3861982ab129ce16b7554efbc8a88722 SHA-256: bd9433e55b270d1229a9aa0e97c878174c262f9c25f6620c45d3f42121257184
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://aow.infogestnet.it/ckfinder/userfiles/files/1125188808.pdf In PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/tenesuxudomatadelopodoke.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/1bfc15cd26ec2a4155e06cd34b630ce4/50455548833.pdfIn PDF document text
    • http://rococosofa.com/files/files/35530065036.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/96700217940.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/41187284268.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c5210dc17d---gugowidupo.pdfIn PDF document text
    • https://kuepancong.com/contents/files/93507296892.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/671598371.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/17981881952.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090114201773499.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/63611480327.pdfIn PDF document text
    • http://888chji.com/userfiles/files/38607525290.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/12744014336.pdfIn PDF document text
    • http://clingac.com/d/files/70006624463.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/14674828917.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/ravipepumug.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/doguveg.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-5/20210905223509196108.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e518f6948d---faduwamubile.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/68667590568.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/kizobezevomegakozilud.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/85654532201.pdfIn PDF document text
    • https://petikdaun.com/contents/files/47640798114.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/74490386140.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614372dfe2c69---merojefemepufoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=logitech+android+mouse+appPDF 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_off0000d97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97B 17896 bytes
SHA-256: 43d813f4a5d8d8e4374c9a8c4969ce50ce0307f07ef1efdc1026a34301127d0d
font_01_sfnt_off00010803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10803 10972 bytes
SHA-256: 74258118ecde2f18004783d4f11266066db4150db908e77bd8f83a7cf374d1cb
font_02_sfnt_off0001211e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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