Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d70bdb58bb46b2e…

MALICIOUS

PDF

78.3 KB Created: 2021-09-09 00:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bac1376f8438e62113e5e208b5759ac4 SHA-1: c7bbbb5a76679f381e540cdec3cbdb2308f55d62 SHA-256: 4d70bdb58bb46b2e1e9fc2ea0eb5ccd540cf186c392d251cefc046ad8c3f468f
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

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://coretry.ru/uplcv?utm_term=redmi+note+11+ultra+bangladesh+price PDF link annotation
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/2ce26ad71d68be59b6b442ea41ef1744/tesufozobibusubanaxumazuf.pdfIn PDF document text
    • https://maturana.cl/upload/file/lutiv.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/fusapuw.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/11364746949.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d28779c22---94463475131.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/zotagikelenivijakesawove.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/25787004839.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7e4121677---48245809539.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/96224132725.pdfIn PDF document text
    • https://sealskinz.ru/files/file/moxifoxod.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/velozuwufurobijifopegu.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/putudel.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd592398cf---rutap.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/11054358545.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/36569619161.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161353bf70044b---beveseduj.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109050009161538.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/hlf4klfku3ogb3slqtjqp4a9ot/lelibokipirikozobuk.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/toxomufesufizeda.pdfIn PDF document text
    • https://brakos.it/file/93759704222.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/97475685628.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/90288182726.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16139009b5d2bb---52987559426.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/94396005459.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_off0000c9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20E 11296 bytes
SHA-256: 4cddf0fa9ffaae1318ad7b90e201dfe4e834a9ae30f672ae3fb0223a8526f01f
font_02_sfnt_off0000fc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC01 18368 bytes
SHA-256: 9b94d61557b5f6edf1bea9a3cb5189e24c87b3749a5c10bb58bc456894de4ca9

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