Malicious PDF — malware analysis report

Static analysis result for SHA-256 d872055a6be2a1b4…

MALICIOUS

PDF

94.7 KB Created: 2021-09-14 06:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d111fc6fa54aaf53136544315656b98 SHA-1: f9b672c6401f9d8dcdefcbdd7e38c11894869265 SHA-256: d872055a6be2a1b4aa4d0cd593d3e41ce9586311b6111e5484c3c7b55633a557
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF is part of a link farm, with many external URIs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://narzedziascierne.eu/Upload/file/62043313793.pdf In PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/5tv2g7kiceeiquu19iotabhv30/94441819583.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/17313764884.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/lotovunubinanawiru.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/66648376817.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/90259687588.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/51405498334.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/88187299794.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/42937984010.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cafd83b692---nozinawofogexemoxubipebeg.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/datinilusatigatebi.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/zidafetokisuraxetaximet.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/97091193080.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/fukafofawovanofalo.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/57108205883.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/nosomumokowabevodewer.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/79979689267.pdfIn PDF document text
    • https://g-stampo.com/pics/pages/file/77526373140.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/25415426422.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/setugilukiw.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/96082810782.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/d0d77b43b579be5605e27c3261caac83/tenusoxogebibima.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/sigasuzulaxixexakis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=after+we+collided+movie+torrent+magnetPDF 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_off00010b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B28 18928 bytes
SHA-256: 501a813d9d65cb3d9a776d4bf4a95ce344e620ae2df29ee8afa8630df0b4c60b
font_01_sfnt_off00013c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C76 10784 bytes
SHA-256: 6eda03ef82743faaa2754ed5c97ccedac8f3e114504c2e8ac41688e5f2b8ca09
font_02_sfnt_off0001552c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1552C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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