Malicious PDF — malware analysis report

Static analysis result for SHA-256 b48dc70e9c2c3436…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 10:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5f786ba41919654fe7a6d07ae1b09d1b SHA-1: dba5f7e0b4dd066ccc7679c7a0670b01f31dba7b SHA-256: b48dc70e9c2c3436a3ad3520cd7b870b26c586793cc8b1e18c5b4c8b08855ff3
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead the user to malicious external content, likely for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/uplcv?utm_term=ver+archivos+excel+en+android PDF link annotation
    • http://keralastatetailorsassociation.com/userfiles/file/mojemalus.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161329ff5f3c60---nesapodaratobosir.pdfIn PDF document text
    • https://jin-ji.com/upload/files/27601032543.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/c59ccb55bbe388d8e2593faa434c978d/58964354315.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613834699ab0c---68503427000.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56665075707.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/boluwijarobenefe.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/46715151721.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/sedutubire.pdfIn PDF document text
    • http://normel.org/files/upload/file/luwejugisipipasadoradaz.pdfIn PDF document text
    • http://iccarrentals.com/files/file/63006895540.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/6701147189.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/89604216497.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/wekukofupuzekofadijida.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/sivaxajekozojoj.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210905_9896357F03DC62E9.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b7ee0f73a---54513822744.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/36631767386.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/22527140423.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/86485261737.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_off0000d714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD714 10508 bytes
SHA-256: 1b08984e3a9de9d33eb6c6709e01349e2f94ed6e15aed9c17f8bdce92c5b8ce5
font_01_sfnt_off0000eee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 18908 bytes
SHA-256: 728003903c4ade9c608437b50ae824806354baa9178410ae670f100f8b5179da
font_02_sfnt_off00011f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1