Malicious PDF — malware analysis report

Static analysis result for SHA-256 2221c8eed005cee8…

MALICIOUS

PDF

97.7 KB Created: 2021-07-18 15:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: de1a657f57d85ebf1f0e2b057743adef SHA-1: 24ec44a148b9adcda221b5cb73c2077403f744b6 SHA-256: 2221c8eed005cee8cf32a6cc3c9afd596f28d4cf9ff31d1484f7aaa32978b483
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish for information. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/c2b2443a9486fbf6b9b6a59d9a42f4e8/saritekolidupafelo.pdf In PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/81030217c98bae28cbdb8d5a4a602993/lovadodujuzofigezoku.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/af5b33637e7ca14235a88096e0cfc8bd/38175492080.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/dimegupi.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/36114177769.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/06/files/210606131336.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/17729042491.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/ramabifokizolonax.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/wogokupowufuzorusilap.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d1f492fc44109737b5ef94ad0efff06a/bamurikixupebedimul.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074243c124c4---tajizosokufebapudulimo.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/wugenabawer.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/jiludejuvox.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/95c5d202e8ce59d64c93c2a40ec1c9a6/18325707197.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/xegibufe.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a95938377---34049725144.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b45622737b8---9137471428.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/61174037449.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088042600b40---tujibabuvagugotutukaluko.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/orqdpct9c8fm0mviha6m0fv6f3/75387401968.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b418e206daf---98838662253.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/6ha3c8sca1it2vgk76h7n778eg/morezozitede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=verne+harnish+one+page+strategic+planPDF 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_off00011bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD4 10624 bytes
SHA-256: 0538103b841292fef88b615d0652711a39e13c13169d3dae7dd68cbe53ca2889
font_01_sfnt_off00013411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13411 17360 bytes
SHA-256: 6ac6c00426b4092a65700c79d876c9a05d89bf1626400c5e873860f9eab20640
font_02_sfnt_off0001616a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1616A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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