Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b02cff7c4b5eb58…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 22:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 61b4db65dc6a62a4c5ece0d4ece23661 SHA-1: f5633e803f56d6299462555d31bf2ec68896b733 SHA-256: 9b02cff7c4b5eb58b091d7ab2833aaa0197a4c33f917022f0d0f875fac4ef36e
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV and an ML classifier as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the overall structure and URL analysis strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://st-communications.com/ckfinder/userfiles/files/tizibaverewanizupo.pdf In PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5bfa574a487223b7f1951a4da79fb35/pesegukuxatuvi.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/eabgpfh8c9g8hqlou2js9h3s2i/sorexulub.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/03cddd4710ab9cfbd199c7d757b88aff/26195304057.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/su92l219ir5i9tkrdnnhi78dl8/17094472783.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/68146c3fed0a7f6ed39e10a589f383f3/nolumibis.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/silakiwolop.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccbe4bf10f---kudere.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b67a84d7a---11791754911.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/nilidujarazurukejuk.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ee623fd55b2---bomogumurepiwizoxoku.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/wavipixisewe.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160dafe74276d9---23195476770.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160832060ac471---famomexuxijagilokul.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/kumizidukeban.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/4695398322.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/97613884779.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/wisonowawedidaseto.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/jojoxir.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ee31f4338d3---polajubumotifil.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/72555520904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=raag+yaman+bandish+notation+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_off0000c4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD13 10964 bytes
SHA-256: caea6477b605049a700123d484f71d8584bd61cb45238d317d40416d86d25c02
font_02_sfnt_off0000f5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E7 20872 bytes
SHA-256: b57ec378994e44628a820427f2dca32f4a53e1bbaabf32b21454dbf1eee44fe1

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