Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8a3f3c4bf65b0d…

MALICIOUS

PDF

80.0 KB Created: 2021-09-01 03:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6004d0a5fea9a5efdd660df2344b2c9e SHA-1: 453c4aa28ddc71e16b740a90513d66bde6c6a1c0 SHA-256: da8a3f3c4bf65b0dcec61ea9799332e846af9e93a16ee59f14eca12ef5719556
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs pointing to compromised websites and disposable hosting, characteristic of a link farm used to distribute phishing content or malware. No scripts were extracted, but the structure and URL patterns strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://sharadsangam.org/UserFilesTwo/file/59371713441.pdf In PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161211f7e0fa84---tofixisuki.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/janipupisatadanumip.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/g4e85231j28e008r33h9c4utcj/zimowomumowexujubi.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/mipekobewuvololu.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210819060604_812412394.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fdf4de75a1---36148344795.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/6m51s7vfjk0cnbtjp4moomlf61/76814461050.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/pajijukewafaliwukupasejo.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/14982270849.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/21815121447.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/49313638861.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/21162074191.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54ce6eddfb---42788501389.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/woxona.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/7812395941.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/88542b3df1061c8c13410979689505c6/teviwumejujetuweb.pdfIn PDF document text
    • http://fitviewer.biz/files/file/6418791596.pdfIn PDF document text
    • https://jjpremiers.com/files/narap.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/26503105827.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/kinevu.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/rurifupud.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/db9c475cadf6d62037603a10e633d5a9/lifakusipufawo.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/repuxurufejizonemese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+update+mxq+boxPDF 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_off0000cf22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE739 10608 bytes
SHA-256: b2769fb7ff47f9bc30c8a79a1ee5edbb6d863a1db0b620e8f53fa75976959ce7
font_02_sfnt_off0000ff0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0F 19792 bytes
SHA-256: 3a8a791df186b88792e2ddec2fe63cff64acb8486bcaddd6a80e9249bae684b2

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