Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24b65d248ebf684…

MALICIOUS

PDF

92.3 KB Created: 2021-09-11 08:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e10901ea30c91cba079fc112152af7eb SHA-1: 1e9bb2565b95c85ea2d57fdda8415f025365cd47 SHA-256: d24b65d248ebf6842d48d5d86bd66fb85f9a32f18ca0c3e38aa67aecfbe0c809
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5472

Heuristics 5

  • 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
  • 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://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/eci66qico3unnvt3q8g6q1ln8l/sotoli.pdf In PDF document text
    • http://antonio-pelella.eu/userfiles/files/58151393126.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/lofoxonawegaro.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/8488522661.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/89487639051.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/80807022755.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/gajedaponutagajabanewavi.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/fe88e4dbb7ad8b591493108ba156cc77/61625697002.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/tuxilurodefiwibinokefim.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613a25458fb7f---jebusopawise.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/14719624036.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/bekidejakujupone.pdfIn PDF document text
    • http://yongqingtech.com/d/files/kufalenovizevesak.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/55525327285.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/fiduvuzejisezezesanejigu.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/46159623353.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/selobo.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/34010284003.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16130d069b6b67---99374674113.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/80945512852.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/gufasunuvifogifopuxewakaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=watch+prison+break+season+4+freePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF3 10836 bytes
SHA-256: ad04eada268499c6d21a1843aa8470631971691cac414fbccdec3f0942ad2bbf

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