Malicious PDF — malware analysis report

Static analysis result for SHA-256 89847a32c03349b3…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 08:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e43a842901c3253cb8eaefe845809a2c SHA-1: 197649b7d24590f5ae211edd282c6ed767ea29ac SHA-256: 89847a32c03349b34abd612ffd3e79402ca5a0d6cdc15d1e99ebb94413c44b20
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://rosg.net/sa_upload/userfiles/file/20210721022434.pdf In PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/db318ba071baf75c72e7282c63b7f2c6/20355409743.pdfIn PDF document text
    • https://koratspring.com/upload/file/16907001169.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/fogodaxalapinoxus.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/10323352464.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/06713717b1fe3ebf20b60e7c1135f763/godewevexomonibozim.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16116886772d18---kikezavodizodobojidofa.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/18341423066.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/jiramo.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/1b2e77896528303717777b769c78a6aa/55682491426.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/ludozebafuwugifoxos.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/6df8a284ae42f3c39e0a1980ffc31802/93790148356.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/0780122699b483cc2bec4c4347201832/37962923767.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160713dd7b1247---wokoxofuregapimukonerizi.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/56872032283.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/27052737687.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/dikinoto.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083a179ab2af---torasajupolelakomifisipu.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f10618cd37---29330548129.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/fuzepiwikadipalugi.pdfIn PDF document text
    • http://a-pluset.com/userfiles/xekegifelifizopewa.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fb8b9c66e---23380624877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ikhwanul+muslimin+pdfPDF 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_off0000dc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6D 10544 bytes
SHA-256: 2ddbc50c59b71914cf615203483493d78c9f7b6ce3bf13f481ec21639dbe87e2
font_01_sfnt_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 17476 bytes
SHA-256: ca9a47a4f55dc87e28114ddc65c73c7cf6039da9885fdaf3b4ef6795c92c5409
font_02_sfnt_off00012190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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