Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d10bbbf00da743c…

MALICIOUS

PDF

79.7 KB Created: 2021-09-08 04:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 75ac1463d846bbb0743712b6ffb68c82 SHA-1: 6131b93ab7d64d300cf3662b89c76c7b82881989 SHA-256: 1d10bbbf00da743c9c8b13a1c60357eb8dbc7a6aa111c67b737fc51999fcc53a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/b3h5e7cfrcvj1m3emh08j20iri/67297529813.pdf In PDF document text
    • https://anitt.in/ckfinder/userfiles/files/12924141055.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/mojebikisixuboz.pdfIn PDF document text
    • https://onlinendttraining.com/files/viledafogek.pdfIn PDF document text
    • http://dongsachhanoi.com/webroot/img/files/51367391436.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa544d7e46a---74132603126.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/40857683524.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sovatemubosawazad.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100d89223fea---fikuvajip.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/gufepavup.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/banobusafuvugagotale.pdfIn PDF document text
    • http://theshippyfamily.com/clients/57051/File/46463117804.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/32860637677.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/40141331872.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/pifozikukapivenogiz.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/c8464nu5j4mb6cj9rp61p7t33c/9481882636.pdfIn PDF document text
    • https://safehouseservices.in/fckfiles/file/pilumawixadax.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/4682943448.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/927f726ce9700dd164c59db247a63423/26291013555.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/128d089d35f3c8a374af7a7939af34e1/kirefodovafajudekarobomur.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/88701801494.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe7fd1eb1a---69233577498.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3888c62154---mizizukamisesasu.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607175882f49f---78396523466.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/42528512878.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/fdcse6p297mvdkiil27323gl25/tofagujiwenijotazedoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=sedentary+lifestyle+and+obesity+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_off0000ce6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE682 10820 bytes
SHA-256: fb389ef91606059868a8ef69308c257c1e902e6874ac5116f66de8564fecbbe8
font_02_sfnt_off0000ff5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5B 18908 bytes
SHA-256: 275888002d4b69f0e985371202210c4ae91d29661788c8854c1eaba4662141ad

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