Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df5bc15e4b07dce…

MALICIOUS

PDF

83.0 KB Created: 2021-09-07 15:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 71b74e28e40aaac189187da5c935aede SHA-1: fecf13868a5a343c922c8e48ce37380d18e39a27 SHA-256: 8df5bc15e4b07dce5b81cf198cbbb5c86ef427592d8c2b1582be740b45ca0820
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a4374f1676e---53209871959.pdf In PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c2725c92065---40252371343.pdfIn PDF document text
    • https://vestol.bg/files/file/90923593773.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/5512631914.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/43620225540.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/e11a91b764f376032e07334484007d88/59960855016.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/42146842539.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/vifoxuvij.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/53167435663.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/dujesofofod.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/95576200984.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a34d30b4151---35869312937.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/16224269484.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/81328074024.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/47591682678.pdfIn PDF document text
    • http://ministerium.pt/files/wibikikerodugite.pdfIn PDF document text
    • https://toocapen.com/files/sepemusuzi.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083cc9f9a1ae---35167597467.pdfIn PDF document text
    • https://rjpexport.com/files/mutokegezofalanuw.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/gggrovqac8boskp2vpfat36p71/93096391527.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ifm3m18fsibqa956io4vr6te03/gedokeximon.pdfIn PDF document text
    • http://normel.org/files/upload/file/lopomufagizanidoleg.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/67332946575.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/vadibekeditijasowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ratio+and+proportion+worksheets+with+answers+pdf+grade+6PDF 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_off0000db2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2D 19028 bytes
SHA-256: 46098bbe67b8030536f0f1e4d9b4ce7528d470039f5ad7437c8fa86e0878879f
font_01_sfnt_off00010c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3D 11120 bytes
SHA-256: 6c35621823aaa02b9d048ffa25f49e0fdda46ac07974938a7919a8c62a6cafd4
font_02_sfnt_off00012614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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