Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e53bc6d7c712f1…

MALICIOUS

PDF

72.1 KB Created: 2021-09-06 13:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 21310b03f545540e20a2ccff8375fa44 SHA-1: 3353c2db97231688a4a47110e5e909902617cc72 SHA-256: 50e53bc6d7c712f1e24fd15e0fab627d3984b704679923e693ff4dca7054bf6a
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The presence of multiple PDF link farm heuristics indicates a deliberate effort to obscure the final destination or to leverage SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/furimavine.pdf In PDF document text
    • http://resheto.ru/users_images//fck/file/fokax.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/82112452219.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/16280139483.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/54c2c32c96e0990cbda66ebd04b5f8d9/gubitigagetewekivek.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/93417458605.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/cb1a090b8f9c6028db4901981b3404d9/kepawijotedamovalamov.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210817161717.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/1796539177.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/pig4vqj2jd7crt3s2o9nf0a5b0/geriletuwop.pdfIn PDF document text
    • https://bczenekar.hu/files/file/kijukerobixabel.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/76381094433.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/94962614491.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/41917959644.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a25cce9f43f---dasirakaxig.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161089bdd00817---87594679669.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/19468822112.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/74953773905.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/98807785194.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/biliritibuboxi.pdfIn PDF document text
    • https://aful.edu.pe/ckfinder/userfiles/files/bexuxobexaduxirubukawuz.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/riduwixubepobatunaxofemu.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d72913d0f---zijijedib.pdfIn PDF document text
    • http://abpaluso.com/upload/file/46429197641.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/gaxamu.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f9fbd6c3773---71439503244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=cepheid+genexpert+iv+manualPDF 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_off0000b7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00D 15840 bytes
SHA-256: 4d6e9534e4f1f1cbccbdac739d34f9d86139682e584d38f68f9836b8c5b51cc3
font_02_sfnt_off0000f86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86B 10852 bytes
SHA-256: d53236fb959d26365ac06a0391a7686f0f77a9f9f552b2e7dba2c6f95c7fd400

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