Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af8a3becc664456…

MALICIOUS

PDF

102.1 KB Created: 2021-08-01 10:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 642529d7ca88405cf50804ed011bf71e SHA-1: 2dbf3cd11d0311a0a1478e700262c8122f5b8619 SHA-256: 0af8a3becc6644565f9eccc139c22a2f9eea21b00bf2c1e00f3fa3c01553a56c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attack pattern designed to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a3beebb72658850299ac5e55d5b9f9f5/vasafigoba.pdf In PDF document text
    • https://bettyloupaints.com/userfiles/files/zojuwujarogelakug.pdfIn PDF document text
    • http://scro.ru/pic/file/vurisenonalanel.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7960cc23b8---kavomufinepikakow.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7f1268afe---64441454928.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/44461944021.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e661ee27bd---dulujog.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/91894815695.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/14479927116.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/tabuwavaf.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/23191227789.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/2c00de8715ad6fc6428320e4f5675746/zitonufuwawinojabekutexo.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/5c44791403a34c38784da1ee79fe6e62/fasifimenozivuvekeza.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/pns73pr3nfct0nirivt5docg53/baxake.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/a6rabh50e5qbi8pdtt3fbm1289/27253626150.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/k4nci38fh4ljdlsme38huoak87/talunevezofaroziva.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/cb0dbaa54472c6cfa9480d59518b040d/likiwatunuxitefivo.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/78qojepa2g75i30og4ecfkse43/31005228793.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac12a40180f---92335243596.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/goleritesewebolo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f216d00f03d---15372382206.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a105adfc06---56655545581.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/m4m914ghq140c7n4eqo4mhlrk2/1658175075.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/tujimazivapovetavuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=descargar+traductor+de+ingl%C3%A9s+a+espa%C3%B1ol+gratis+para+celular+sin+internetPDF 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_off00012382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B94 18928 bytes
SHA-256: d39eb7ed1470076affb9a97e4b4b3fb554c0d61dcf87da287e8ff804c45633d1
font_02_sfnt_off00016c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C53 11148 bytes
SHA-256: a1758b633eaa7db35c60f5c2cb3e39921ec94f9bdbf8dd65acfbad18047d95fc

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