Malicious PDF — malware analysis report

Static analysis result for SHA-256 49dfee383d84dd2d…

MALICIOUS

PDF

82.8 KB Created: 2021-09-10 11:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: a7ec54f131d557562cab5bc863c388e9 SHA-1: a9648bf35d499fda11c920db5ed3bf087a3f8417 SHA-256: 49dfee383d84dd2d6ed7d0ea6bb9c9a70d1b71c5c011a92103239c1eb9953d35
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=download+tema+hp+android+doraemon PDF link annotation
    • http://lamelove-zakryti.cz/userfiles/file/54488391363.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/folisokoleniwuwobe.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210908082120331675.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/redagov.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/mafotuzit.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afab71992f---kimebu.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/733567900.pdfIn PDF document text
    • http://www.siposferenc.hu/html/kagomugewof.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/bimasejuwojalu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/39951711731.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/42331482173.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/78754205647.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138ff49b1f1f---96984447223.pdfIn PDF document text
    • https://tdfstore.it/file/11528785827.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134795d318bf---84519477988.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/67988125209.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/fozifuroxolerudafozureb.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/11115854503.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/98711845933.pdfIn PDF document text
    • https://maria-galland.ru/files/file/nimebuboxunuwazozositan.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311516a9140---ninipowaxowa.pdfIn PDF document text
    • https://porfic.com/fotos/file/tafuzudezopege.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/zuzagevubesisenol.pdfIn PDF document text
    • 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_off0000dff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF3 17540 bytes
SHA-256: 1fdc5b561862a58cab4b1ce5b3ab304af02564b1cfce4a343feb91fcd5de3b75
font_01_sfnt_off00010d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12557 10576 bytes
SHA-256: 3814e7f4f213e040d4b6d9dc5eff6bfafb9133269b7ec8b3b657aeae658deec9

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