Malicious PDF — malware analysis report

Static analysis result for SHA-256 01e5393d0668d805…

MALICIOUS

PDF

69.7 KB Created: 2021-09-15 22:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 497fc2ebbb212261e0bac32317ccf1ed SHA-1: 6fc1b5154fea3a84648fbc0742a01f36b5e92b4a SHA-256: 01e5393d0668d805896852aff2fc74ff2d967c4b878c0335ac07139de1853d65
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to create a network of links for SEO manipulation or to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://irlanc.ru/uplcv?utm_term=android+startactivity+animation PDF link annotation
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/f3a995b59de3a0a7bdcfdab70013f40e/52492909839.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/2559653140.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/tudora.pdfIn PDF document text
    • http://sksound.com/userfiles/file/vixutorikobebakipezeb.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/taselokazibem.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/tojilajes.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/wowab.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/19650217762.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/vuram.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161412fc3c6f3e---21523421465.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/mapuxatozase.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/givosem.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c4371fef9---26230146381.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/11493808731.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/82137121165.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/98120326099.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/16092802652.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/misikeromeritoru.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/nubumawapu.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/jejibese.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/nilgh2vkg3t66rml6hp1o3f8nc/vaxefekozafo.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613191aa7c3f9---73767497079.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/doliguruwobofubusiwe.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136af2b3e8c6---dasemobavisokabutiji.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/70488798133.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_off0000b3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F3 14800 bytes
SHA-256: 05a96f943203e96625bfc62152b7f4dab75a8b1026d9a42a3544ea2d26d41b69
font_01_sfnt_off0000d956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD956 10512 bytes
SHA-256: 8c1b0bf970dca9db5ca69747f8f6b91fbacdd1b19679ec734b00ede50f6713dc
font_02_sfnt_off0000f153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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