Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ff057e4d2ad6b2…

MALICIOUS

PDF

80.9 KB Created: 2021-08-29 11:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6542416e15cf2442d24466a65d8fe134 SHA-1: d797b62190a4be0f4a7479ea207bf1d572710683 SHA-256: f8ff057e4d2ad6b22499cc6b30d6808df49705f98df23c955bacc779cbcd7aa9
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to compromised websites or disposable hosting, indicating it functions as a link farm. The embedded URLs and the nature of the heuristics suggest the primary goal is to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a6a069e66---61283463871.pdf In PDF document text
    • http://aqbnb.com/uploadfile/file/xodujediwafigudawesupaj.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6dad11ecd8458eea0270e018a72a0be2/52229396482.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/76761213859.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/fafajaginofuxolatofaxi.pdfIn PDF document text
    • http://midel.me/userfiles/file/kukurobebixazuru.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/vimoworiw.pdfIn PDF document text
    • https://pellevah.com/upload/files/92344935636.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160959cec15c13---sumorujom.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b43d6fed7fe---89466170112.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087552db9b61---resoziwudor.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/28593072716.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/4105184542.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ac819b8c1fd18a39c06105911f7aa8a4/pefatijojozidozit.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/denexawodapokozetowaxo.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610994af61f50---fejusomebimupik.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/sogejajog.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/pewusolagezip.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/7nb0du4kftlindk67ohe16h8ms/94321264219.pdfIn PDF document text
    • http://hotstamping.pl/files/file/53676241005.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/bid9kgug41ikb4hqh3bqijb6a6/66603479504.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160905109ad115---butinowisega.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/87323085809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=download+synergy+one+ui+apkPDF 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_off0000d23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23B 19136 bytes
SHA-256: 2e5ae080fc888becc092a1c38d3e7e0578c32e1532c7c5a7eca80273e76a102d
font_01_sfnt_off0001048e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA5 10864 bytes
SHA-256: 1e8c6697325cefd7a758f27266d9ff27c9b540dd80646057b79c040484d5de0a

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