Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fca74b81f9ff948…

MALICIOUS

PDF

91.6 KB Created: 2021-09-07 03:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 805c9be0cff969eae12312763b2a4fd9 SHA-1: e6a8b431e11950fa436e562a0837dea8a7c394e7 SHA-256: 6fca74b81f9ff948429b6c3dfb5ca32e682ae40197cd117234b9926753b307fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. While no scripts were extracted, the PDF structure and numerous external links suggest an attempt to lure users to malicious content, likely for phishing or SEO poisoning. The presence of multiple links to compromised WordPress uploads and disposable domains reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://amandamaitland.com/images/file/72316917464.pdf In PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/f0df91d8fea14f2d609feee1135421f2/tezigaku.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e4ba749e4---jidurezoluwujaworup.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/e09315a5c00ea1c87844a2f8d857fe52/wigolixodubakazi.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160768d2b802c0---mirufapifotew.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/gulefaguzanixegif.pdfIn PDF document text
    • http://ranch.pl/files/file/61907383655.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/30feuh5fnvg7ib5kb5sntu3l5n/jeresikegeni.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/xetibofixisapaweri.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/h444ssquj9cl5kftgtf9h3j0kh/tatubaxosulirefup.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/wenanavetexuzebux.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/j4vkrbdmds6m16pgflroar7v2f/xinebelew.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/06/07/file/20210607_023449_163.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/79753093221.pdfIn PDF document text
    • https://aokman-drive.com/d/files/wupegugugutututexomunud.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/058a3d438c51a26d22a77872ae026b74/6790361730.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/zipatazijed.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/26540458753.pdfIn PDF document text
    • http://jpmoto.biz/upload_picture/23489704321.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16102fc06608f8---zakujuperigobiwewomap.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc94b3a760---60033772625.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb20aad5f7---lugiteboleg.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/bimek.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/800e524141ea6084f2cd4a166feba973/doxumotobarozigubaj.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97d3a1a5bd---17731947640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=high+school+grammar+and+composition+book+pdfPDF 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_off000101bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 11160 bytes
SHA-256: 0ffa7c57d1a320b21a50d0c49491101e7cf1e92bc58e4d312f324b1399adcd05
font_01_sfnt_off00011b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B25 17588 bytes
SHA-256: 2d4ba1cc9064a23df4293cecefcbe33202f76ab1473831e913cc560ac7840d7a
font_02_sfnt_off0001489a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1489A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1