Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6be3df69660ed5e…

MALICIOUS

PDF

69.2 KB Created: 2021-06-23 09:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ac39ce2928b506434c50e95a66df1c61 SHA-1: 07d62dc8a3a9d0710a14601be17c7e9866f6ef3b SHA-256: b6be3df69660ed5e5d0dc3b833a04ac448158fdac3f59e4000fd85a7747e0928
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607699b88c92f---sakadokowovavuri.pdf In PDF document text
    • http://greenplanetnepal.com/userfiles/file/23719474920.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160722c97828a9---dipamufis.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/23de3c12a646df6b28f53702aae4d55d/gozenobosegowefete.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/f9ff72f906b101ccf97fd570e25a77c2/delivakuzapinarevemoropef.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/16074784439.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082604f380cd---72823062899.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/80397828732.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa69da5d8d9---sowovafusisoguxeze.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aa65fa08601---33691906523.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a71a654ccf3---kibulevon.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/gebegijobeni.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f2af05f5a---lemibekegeji.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/97440842769.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/pebafakitem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+chronicles+of+narnia+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE82 5284 bytes
SHA-256: 157b12bcda4267355a13f34a7efe68033c5b65860a1cb6da431eb59efb279279
font_01_sfnt_off0000e087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE087 11804 bytes
SHA-256: 5cb4eab8ee9b64a38022a268ab03615c6bd9bc62cf1ab4eecbc45c6a9ee20f64

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