Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d854667eae7b23d…

MALICIOUS

PDF

79.1 KB Created: 2021-09-17 14:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3c1980593104e65c625855a5ef052433 SHA-1: b9fb7321a692be3d8a6ef55bc5008dda6af9eecb SHA-256: 3d854667eae7b23d06467cc79ed4ae0f142c259381b2c1055abf722069060cb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous external URIs and links to disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment used to distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://pixomot.ru/uplcv?utm_term=kingdom+rush+vengeance+mod PDF link annotation
    • http://tortsurprise.ru/upload/redactor/files/voxamajelukezo.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/lowabekuso.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/mizeveneko.pdfIn PDF document text
    • http://thefencedocumentary.ca/adminfiles/file/ludek.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135badf95c68---98754456750.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/89457380119.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/1205131172.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/nomobefofinafakexoni.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/hthcrnlm553npqqlg3q4i4dkd7/mudopo.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/23446382399.pdfIn PDF document text
    • https://greengenome.in/admin/userfiles/file/78059031967.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/mazapenixobo.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/42440077966.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/wazowofebunobuziraba.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/32659458562.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/goxasufanagovudef.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/jeneruzijosum.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/fozotatubofatisakorejo.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/80731342860.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/eg5kv2de923rdrv4bqs0n19h33/21902602581.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/jagelirugavofu.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/24832182215.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372ad56f831---96435050119.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_off0000cc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC03 10828 bytes
SHA-256: 0a76ecd8ac218201103cee8a98db12b48ba9d6ed9e2ad5a59809ea572b4792ab
font_01_sfnt_off0000e48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48E 19680 bytes
SHA-256: 5c00da3523ce4b1ce116a1d66781026b6a602f9d470132b67cfd2f64b5e5f295
font_02_sfnt_off0001170b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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