Malicious PDF — malware analysis report

Static analysis result for SHA-256 edee1f7701e81008…

MALICIOUS

PDF

73.3 KB Created: 2021-09-02 20:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4ba51f13e69c54735782559fa8c9bd0 SHA-1: 989bcbb8c4ae030fab696cd5db0db5cdb545e2a5 SHA-256: edee1f7701e81008789067815183f10c73b5b93c044aafc8d8ad2bb0cc819255
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF containing a large number of links, many of which point to compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate this is likely a link farm designed to manipulate search engine results or redirect users to malicious content. ClamAV also detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c19cb71103f---nulesivi.pdf In PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac367bb3cfe---zazunizakarakunave.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/44842230279.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/34107962678.pdfIn PDF document text
    • http://siembra.me/uploads/files/20757568171.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/94101436156.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2ec1251c7---92786922911.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6274962ab2a690e8f18c5dd0bcf99b22/fagedefuwazejugas.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/79397926876.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/mulajawuzoveta.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/voripoxi.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc95c791fb---segivu.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/mexesevixepaxofosifijax.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/i7bbru8b1ioq9cao7n68q44ln0/7270213914.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/kujituravokafojixutazimi.pdfIn PDF document text
    • http://elitvorota.ru/f/file/10114919898.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/seporu.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/8522d45cebe2c6b45dbdc5257e5843c4/85713411353.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/d156dd0526f563e23e7acf0a4db85862/devikexog.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/zubabidemepakolosedugibup.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/70740270768.pdfIn PDF document text
    • http://1975geegees.com/clients/78603/File/76193419439.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084f0601c9d4---28140777892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=measurement+units+chart+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_off0000bd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55E 10812 bytes
SHA-256: 46af707e3bdcba27b9f2812753ea6f6b6d78edd2e7441289a93fcc40d3fbdbcc
font_02_sfnt_off0000ee16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 16252 bytes
SHA-256: 2388971ec755f09694f6a145b290e76b49068c576da6b92fd30a6b77d617492f

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