Malicious PDF — malware analysis report

Static analysis result for SHA-256 32afc53d34d1323e…

MALICIOUS

PDF

69.5 KB Created: 2021-09-06 16:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 892fec280ce838f399d23909d6215d19 SHA-1: 7b1bce9baa281c45460c4dc81ab5c6d7525e6f6b SHA-256: 32afc53d34d1323e938b557bd3dcf988e48b9d853da8386dd6e7deff23987232
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution campaign. While no scripts were directly extracted, the presence of external URIs and the nature of the heuristics point towards a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160abef0ac80d6---12693714510.pdf In PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/23257427596.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079abe2073a6---32416094129.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/52575739598.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d04c25c7c4---kubuzorobobizaj.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64f51dd887---kanonojetig.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/41286675290.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fe0c3f47706---bufikexebekuzemeta.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/6399589647.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/12769816323.pdfIn PDF document text
    • https://oliogalanis.com/file/xufazigufakoxi.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/89823911044.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/bf72c69579a931c0b746a17e47580860/menumon.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/94221561641.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/572925100797aebd4792286d1ef86135/50907256296.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/21824096238.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/10314303591.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160804b2e87c57---vagonofolifa.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/warozusukefavovakem.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160798b6451d5f---72327639801.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/maluk.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210625_28D121D9C0D8284E.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=honours+2nd+year+form+fill+up+2019+pdf+downloadPDF 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_off0000b133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB133 11316 bytes
SHA-256: 8b27db0abbebad74dc72eb19f91bdc576ead90f72856cab3b9d77f97b8abbf02
font_01_sfnt_off0000cbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDD 14536 bytes
SHA-256: 74917ab438d7c9b6f81eb45ba2057fd0849418475f8852c2d8126bf18ae7d522
font_02_sfnt_off0000f06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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