Malicious PDF — malware analysis report

Static analysis result for SHA-256 d648eaff3c823994…

MALICIOUS

PDF

86.8 KB Created: 2021-09-01 08:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a8a3858e95b8923850e01db557bf2ef4 SHA-1: 9204b8b9ac3f0250b636b481adc2d256a9a5269a SHA-256: d648eaff3c8239945d9b9affa196642c887aa7723e339671036d40cd1ceedd1d
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, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous compromised websites, many hosted on disposable domains. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://crewmak.ru/uplcv?utm_term=black+and+white+striped+water+snake PDF link annotation
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607c72cb545d5---70466343761.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/zixari.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/68172176031.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/83fbbe47c55fc190086ab4d0cf7dc966/64698685780.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210810_9A67D56AFE6A305F.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/31308976265.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/6126040141.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/dowasovuropogasatofewivev.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607974f942aad---rilizijofopopupamivup.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/d498273e324c6fe228faa04d68afddd3/zujitopilufatuju.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/43978356303.pdfIn PDF document text
    • http://roocenter.ru/upload/file/44948498611.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///36627065529.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/senuwexogade.pdfIn PDF document text
    • http://vina2002.com/uploads/files/rupugiresuxekozedu.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c58ef70faf4---fofigeliwubudubexo.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a687917f912---95491174620.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/nepitex.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d65830ea85---fanokikulexogatusixovisu.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/1187302516.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090a49350c22---sezosewux.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/94683167899.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd20a48655---73176004380.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_off0000eb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001034b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034B 18120 bytes
SHA-256: 76beb090f3bf1514959b80d7125679fa683e0d5cbd29dae6db308f6e97586759
font_02_sfnt_off00013265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13265 10720 bytes
SHA-256: 9dd8b93856dcdb41eb566b5c48057693aaf1b53b8632889cf4bb8e88877bf4b4

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