Malicious PDF — malware analysis report

Static analysis result for SHA-256 2be216e172dbb0e7…

MALICIOUS

PDF

84.9 KB Created: 2021-09-03 09:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8af0ebcf7cb58a31bc1c52ab0ed8ae7e SHA-1: e217109dc785888a6dec616934d991f381d2b5d9 SHA-256: 2be216e172dbb0e710383efa2fefdaa90a479b7ecd8a5b13fe8422b098482afe
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to other PDF files hosted on compromised CMS upload directories. This suggests a phishing or malware distribution scheme where the initial PDF serves as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16087160b22cde---garox.pdf In PDF document text
    • https://dalycity.com/wysiwygfiles/file/jiwujewadoxekuv.pdfIn PDF document text
    • http://nessium.net/userfiles/file/modikotimazuwojejavuw.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/87749019305.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/5735bc6c90bd886f2c1525603609601a/zajebiroj.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/13202879536.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/juxituzonupokorabib.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/kosenir.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/1111e96200f54b580683c4f0a992f0f8/xikimekozi.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///1857053810.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3abf4a431---44553977418.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/xotura.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/donupebitasifiwag.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/59738499049.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/zupugopozibugamu.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/24528456376.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/72364861979.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/83618760280.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/nesavusetopo.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/3017518370.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/48673330484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=vlsi+design+notes+for+ece+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_off0000e7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CB 10604 bytes
SHA-256: 6b1fb7c0225d1112187e6da98ad5d4c2448512ce3ab083b28e5bfa813b8df739
font_01_sfnt_off0000ffee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11800 17656 bytes
SHA-256: 38903ddf383212618a120b48c7fc47315286bb76fb3ccfe8d676104762ae29ee

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