Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c27b2320edd5b3…

MALICIOUS

PDF

81.7 KB Created: 2021-09-13 20:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f6f868970e0b624f65b8928f5c51fad5 SHA-1: 64a1b47a01dbb1191abc5d38f8a6c1d03d498bbe SHA-256: e7c27b2320edd5b387dfff6b687c40fd1d7eff16e56c63ad2101863ae19ec429
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://chcial.ru/uplcv?utm_term=main+chords+on+guitar PDF link annotation
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/tukatujikizirazobite.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf0e332cb---xuzagefuzinapuli.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/radagetomig.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342dbb1d98c---xiximizurununejuvigu.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/vilolime.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/pilejawitowiruvoxuji.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f26d498892---nerinux.pdfIn PDF document text
    • https://thietbigas.net/media/files/2877535090.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/jomimiwunobudutapinut.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/miwetatazekomijuzipopisaf.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/e9d799e9c0dc92a3533717d79a5a81f5/xaboxe.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/5095565580.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/muporamorovelonifobakatuw.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/47834596935.pdfIn PDF document text
    • https://tessuno.com/upload/files/61353b58b78bd.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/tumipixudininakuriketep.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/pafumozuzu.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/20961850870.pdfIn PDF document text
    • http://princeverma.in/uploads/files/84014608124.pdfIn PDF document text
    • http://soc-in.com/data/media/files/86884089891.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/88253154311.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/41897746014.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/90570632880.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/16973111626.pdfIn PDF document text
    • 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_off0000dcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD2 10564 bytes
SHA-256: a4e82661d18b04790843dc86f85611bddc8e566754f64b39467b6659500e6fcb
font_01_sfnt_off0000f4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A9 17180 bytes
SHA-256: f288320db91d79f8ef3e4792f18e7b4f5087787a738e419a10a6bdac9c76d81f
font_02_sfnt_off000120f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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