Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa253b85d6e0b6e…

MALICIOUS

PDF

75.0 KB Created: 2021-09-08 01:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77309f6f30337146469c7e7c80bdfc14 SHA-1: 0b4428c92725b68019ac6bc9b7d41e38e363322e SHA-256: 0aa253b85d6e0b6e9e538d2ed985497b7b54ddf64dc7aad5175f9290d922ce8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 strongly indicate malicious intent, likely phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a1413479695ec9e0c3ce7a5fa37936d2/murijob.pdf In PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e20ca4caa---68323499044.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/sukobalagake.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/be09140315075904233e6f8587de4a6a/17578657659.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e451eb1a0de---zokowidebatijixokomijixa.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/peneje.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fc989572c---taxupusizokilipejomada.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/a35025675b5c086d5459a72a5a7d5c4a/50361210184.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/wajinepilowiwododevema.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/cg7jp1d2k1lqo63e1jv19uka7b/61577850195.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bba1db639d---89993177488.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/wegidonilibopeluwe.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/rosesikadiwugorefekivure.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/nuwonovo.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/51372042749.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/74048484862.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/xadumevi.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/53244408782.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/binokupusitalex.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/tavezajegubemegof.pdfIn PDF document text
    • http://zae.me/datafiles/file/34761791109.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ra3a8mvr301qfmf7neobarm0b2/79390338861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=clever+dog+smart+camera+manual+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_off0000bf22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF22 11068 bytes
SHA-256: 2f21a3373e188794e605a7f09348a60f47eb68e2ed95f63c871c9a84642aabed
font_01_sfnt_off0000d8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 17512 bytes
SHA-256: ac97c56b5e0bbe83dc8d785d873e96bf980b61256f7bebc6fd74afd8b52ab663

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