Malicious PDF — malware analysis report

Static analysis result for SHA-256 660fb24e4747c004…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 00:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6606a04e85b7ffa75d3410bb36b6e79c SHA-1: e365b0ed7c6ffcde7e8b4ebc9c259048b0fbd2d2 SHA-256: 660fb24e4747c004d5c90565224c2fae566326ff474b248a5dad62095a1cae2f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this is a phishing or trojan delivery attempt. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://lapempi.nl/ckfinder/userfiles/files/89174401985.pdf In PDF document text
    • http://classicalgardenfountains.com/uplds/file/50541933734.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/32926489051.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c9e336860---4988789735.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/eadkmppcdlltdll7o2ud1h984b/wasegewizaxor.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/kigazanokitoremaw.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/f2fd2e4a8ba35866145d27065e66ee71/18055613442.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/msr1ovsulrpfu9h9ii21gt0kkn/80987516691.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ug7pkl3kpba9hsk3aohoh319eq/77331631580.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/1af123973a45adafc2a06f781da49883/wuweleloxuk.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/82032299279.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/0117d110d952ec50a251a0a9b2103e6b/8417559457.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ce03d06a8---49506520041.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/40131184620.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/zexerabowojobasefejik.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080a04569025---vuparofumefaxonetoris.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/228e7a78e5b9d8053ddb8763ae4551ab/14311097652.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/noxemuxedexifi.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/43904614857.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa2793b08f---96143916249.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/kedobaxiw.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b17a3974540---11126646239.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/72460390499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=odd+and+even+numbers+definition+and+examplesPDF 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_off0000dfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E1 18472 bytes
SHA-256: 443a405f139b7b7a4086492a6ddbc6edd78029bf98b782f8c5377cfd9986f2d8
font_02_sfnt_off00012837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12837 11092 bytes
SHA-256: 238e00edd9d34a766bcea307db0c27e3f6ab4182e7dd1ab0d2c823ed4ab8a200

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