Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e1b188722ec2a3…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 20:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 218ef10a2eb5f22894b0bb8d920fe5f9 SHA-1: 4b13321868acb925f7f95640df345620b6f8a070 SHA-256: 45e1b188722ec2a34c59e798111b1ccb2a3b6043ea3bf884e29786ec037d9e3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or trojan payload. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it is intended to lure users into clicking links that lead to malware downloads or phishing sites.

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://ketchas.ru/uplcv?utm_term=avengers+infinity+war+movie+download+free PDF link annotation
    • http://fd-health.com/upload/ckeditor/files/50359168102.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/79814403846.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/56326279648.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/22064572813.pdfIn PDF document text
    • http://snkpost.com/fckedit_file/file///20210916_15_11_24.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/gafotuvazofubodijezeri.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/da6030603721d2b4f0f201946bfc566d/xurunaki.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/jujakakupukegedaned.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433f5647a14---54268134567.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5d555fa1ed56c31632d816c13ccf203e/bosexowijonu.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/76881105557.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/jizizivigesegigape.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/vawobujod.pdfIn PDF document text
    • http://coffee33.ru/archive/file/94194759555.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/7469760750.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/24193132116.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/mulorulogaxikitiz.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/17475431981.pdfIn PDF document text
    • http://wirheiraten.de/images/file/nivopoba.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/senerakovegivomokutufo.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/55895518641.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/guwuloj.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/lixelerinemawamubinutexu.pdfIn PDF document text
    • http://hejia-ele.net/upload/rifudikurenimobodododaj.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_off0000da79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 10944 bytes
SHA-256: 9514069b41e71c6def5d17e832296841678fb5f33b2bc773616e59ceba437f11
font_02_sfnt_off00010bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD2 17244 bytes
SHA-256: fd1ca15e5c23f20b432bf5b917e147817bed782fe8cd9e48e79f266530771f02

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