Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5a19584e9310b3…

MALICIOUS

PDF

73.3 KB Created: 2021-09-16 01:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 04eecc83abea1d47aca144aa10b05827 SHA-1: 8a1e5ffca1d0f909e9e790669beef77a3b010447 SHA-256: 8d5a19584e9310b3c25b9899f1732fcac210973770199333d75090f75f2cd8eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting sites. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests the document's purpose is to redirect users to external, potentially harmful websites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://1careglobal.com/upload/files/19523806422.pdf In PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/2939984932.pdfIn PDF document text
    • http://elma1.ru/!upload/files/68399050575.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/97626600187.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/29693100546.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/benezekomogebaroxosubawed.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/nowuzapoxeben.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/mipojolakavogusanifigunid.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/rozilepej.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/90853231336.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/77113344609.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/60432200952.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/falifalezesex.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/10638436748.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357a7c375c1---81502811854.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b34f4b7d0e---63260945928.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/34180115960.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210906000035.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/92548432035.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/73666286832f41fd727af4a79ab69b8a/14640521157.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/c6030d5a006863ca346d36459d0acfd2/xajisubofixufemabe.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/kofuxerif.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/letimepikomuzez.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/19009436724.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/menozusujapinegapifup.pdfIn PDF document text
    • http://kaies.cn/upfiles/210915212036647865yvtnnt.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=android+motion+detector+appPDF 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_off0000bd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8E 16344 bytes
SHA-256: 0069efc60debc8a4ee3c81f429c7843846b890d4cc17cb15b565eb4cae2b0463
font_01_sfnt_off0000e7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B4 10444 bytes
SHA-256: 7e154de70aeee972f8f1408bc0fb2379e3945c39a3dcf9d86bc03cdb6f3cf6bc
font_02_sfnt_off0000ff5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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