Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7dcf80c9968a147…

MALICIOUS

PDF

89.4 KB Created: 2021-07-26 12:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 64792889874d95eb6daac8385752bab0 SHA-1: fa5f7016b3091561d1d1259f9245635f83713bec SHA-256: e7dcf80c9968a1471a5424117d950c332f28e743cbfde5b1829ff25de470c792
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute malicious content or manipulate search engine results. The presence of numerous external URIs and a link farm heuristic indicates a primary function of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://fongyoskert.hu/userfiles/files/barozovuw.pdf In PDF document text
    • https://iva-vietnam.com/userfiles/file/38243109223.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/titinugemufujewe.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/zobodivebewomisepa.pdfIn PDF document text
    • http://alltechsro.cz/files/26512665923.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d594504de---82066670416.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/b812828a08f86f42ac914b5a3cb3a32d/punevimigiki.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ukm4dhjoi8pth42g93amitfko3/48098119648.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/jukagazirawudizewamaketu.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/bupaforadijuri.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210701202601.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/844f3070afca441651d3f2edd0a82119/logasipoge.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b629c09a414---37973351225.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/metofilewek.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/newusutofozatuwilusafuto.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/26844433554.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/fidulobetafug.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/9d7df2c0b3b36878f7455d693062dacc/90616834598.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/dbabf6f13b431993dee916996dc03ba7/zodemolamofesikimotama.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe51c175b04---jewegor.pdfIn PDF document text
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/71231507464.pdfIn PDF document text
    • http://it-hair.com/userfiles/karorogerarob.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769d9e155a5---buzixod.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/bubabobujigakelivazaza.pdfIn PDF document text
    • https://puntoagricoltura.it/file/15746380543.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/rigofuvilovezap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=brief+answers+to+the+big+questions+pdf+free+download+in+englishPDF 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_off0000f6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BD 11300 bytes
SHA-256: 0dd0d258d0cec4f1bcdfaf513c04ca343402d3de18918c4faed7a8b8123529f5
font_01_sfnt_off0001108b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108B 16996 bytes
SHA-256: a233d45e379a3c4d2fe7915f8b9b26ad652337aab79fb8012a6ce05d7af42c06
font_02_sfnt_off00013cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1