Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d348775e5fcba6…

MALICIOUS

PDF

72.3 KB Created: 2021-09-20 17:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 758aae6d3bf7f0f8271f3df0cb987798 SHA-1: 18af5f04f96b9d14d368610d370c7f6b72d71ac1 SHA-256: f5d348775e5fcba6694ae3e812ddcd0143cec20187037e9f08770226a5c06ecb
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://larben.cz/media/images/upload/file/1279955055.pdf In PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614103a262d3b---49689040751.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/fomagopexajelolodura.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/57669801841.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134634892692---runamobom.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/49379031925.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bdcc40fc9---waforaw.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/soduz.pdfIn PDF document text
    • https://proxus.nl/file/vadubovovu.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/73376984671.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/87594986345.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/sikejepigikozap.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/gopakuwalubuveseduwebe.pdfIn PDF document text
    • http://vaikevai.com/ckfinder/userfiles/files/gojafivagexetujizatonake.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/duxeligo.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/bidugoxujiwituwugozofidev.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/suriruvipamojozixo.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/041618279426.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/33320463798.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/kaxafasukefagonukakisos.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/44115768508.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161394238d5e79---5366568398.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161422d98b7842---jalirubovafuniguwe.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/79070452609.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=division+integral+rulePDF 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_off0000b962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB962 10448 bytes
SHA-256: 062d5ab64e25b18b425ed31c3b4bd9392d2429c5c6530b4de1b685f99ab17ad3
font_01_sfnt_off0000d146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE958 16632 bytes
SHA-256: a893549042ed6931454bcf3717cf866915f474456fbd0e85e3a5d1bb370a7c2d

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