Malicious PDF — malware analysis report

Static analysis result for SHA-256 6425b2812ef25159…

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 08:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ba0462661c0f1950bfdb85d0935ea773 SHA-1: 7abe80a2f511cbbe01443f5230c1cde06164c0cb SHA-256: 6425b2812ef251595315bdc24b58b0e54aa6728294b8b56576a1dbaec3056227
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The primary attack pattern observed is the use of malicious links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://crysiq.ru/uplcv?utm_term=medicina+preventiva+y+salud+publica+piedrola+pdf PDF link annotation
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c0799af2dab---46636042213.pdfIn PDF document text
    • https://soechi.net/userfiles/file/6812232586.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/dazixasodupisogomivi.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f0ef79e70---gabulijefikodizere.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/74829040537.pdfIn PDF document text
    • http://premsaktidal.in/userfiles/file/nasopafexi.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/43028143638.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/32028135863.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/mefenugugetuko.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210821_6C339C806D9C6BCB.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/tunokibep.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/bf085af31011d6cf62b4291b90b498d3/xevegazipuvimelipawuguboj.pdfIn PDF document text
    • http://teplospectr.ru/images/files/68840587286.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e66b6a5f3---zijisodudupetiw.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/vaked.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/59225869861.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/piwujetoxaz.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/69678902106.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607837e6852f0---10481917652.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087af2c839aa---bijanuruwagonugure.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/69317856270.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608be2569c9df---962942337.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_off0000d831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD831 19120 bytes
SHA-256: aa69d5a7e3fc881aa171841fb5a94220453735fc22b4bb6c644c8b91ab7b82f3
font_01_sfnt_off000108cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E2 11028 bytes
SHA-256: 988e69087fed68de53d1b6d3c68f308ff82a0516027c9f9f098e1e051b25a168