Malicious PDF — malware analysis report

Static analysis result for SHA-256 b125e3e3c1eae7f1…

MALICIOUS

PDF

80.9 KB Created: 2021-08-26 09:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f219011ab012fc98ee8c3cd2b7e8d0f4 SHA-1: 0293d8c20f0843003cb10e5517142ddb52798f11 SHA-256: b125e3e3c1eae7f1e38a00e4afe59a700b8c376f048986a84be982c65adf713c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users through these links, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://allytemp.ru/uplcv?utm_term=constant+yawning+but+not+tired PDF link annotation
    • https://alshaabcoop.com/userfiles/file/korobokukin.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/0f6bf59d22045295f8ee9e7987401d2e/tivetidozoras.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16099bcaf69077---30593207121.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/o59l58o8gd5pkmdtdgiepopbaf/56768321066.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/74288705583.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098609b35016---46982850694.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/pivolil.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/pakajudufanomodiwixufed.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/5832ecc321e0f49798de64e17ba2831f/penugakititaxesotob.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715969b99a7---xegunulubanatoxukuligexob.pdfIn PDF document text
    • https://ms02bet.com/contents/files/42272880722.pdfIn PDF document text
    • https://designclarf.it/file/25745374390.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/abd3b7021c147d5f51d123ff627578da/dububevuvar.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608684dae3266---dison.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607394b1794a4---91089854775.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609339e149cc7---kutonubijuxedapasa.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/73896972735.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98c8cc601e---29043963089.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/p0iqjoftinbi27d44fkvjiu3o7/fofitizotak.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/428941330.pdfIn PDF document text
    • http://megaeventoa100.com/clients/f/fa/fa03970f5feff24be7017758158681b9/File/fepuw.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/e22e23cfab112167b3a0a7ba8054d04e/pekivevowodijezotixarupud.pdfIn PDF document text
    • https://orrizon.ru/images/file/74588112527.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_off0000db03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB03 10848 bytes
SHA-256: b5538ff56b5228fea4d6709b167f0c19fd58d4f22ab8a824f4dc3311b1180a93
font_01_sfnt_off0000f426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C38 16336 bytes
SHA-256: c908f631e7cfef9e22aa5967eb0b7c633cd7c3425f4b35dfd710157642c6d12f

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