Malicious PDF — malware analysis report

Static analysis result for SHA-256 50484f9020e892c6…

MALICIOUS

PDF

78.6 KB Created: 2021-09-04 22:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2d0b9c5b581c1cf3f1edf4b85cf7f3f3 SHA-1: 54111e7491fb5781a71da86c5034f9600a5fe7de SHA-256: 50484f9020e892c69e6158faa12100052b68e630b3b6b6f17be9830b06331f09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to distribute malicious links. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=cold+as+ice+piano+pdf PDF link annotation
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da1bcd0cb09---xotegexexerorujimaledem.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c17b36d10ce---puzodirumaroroxelun.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/s89cong7ebeuiq94ol4f9eh25k/ralefefijatoxukug.pdfIn PDF document text
    • http://klpa.net/userData/board/file/mokunizedinikiduzabudomav.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/wunogarakat.pdfIn PDF document text
    • https://samtee.com/admin/images/file/24730110415.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d183c4c43ce---lidetupi.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/dedeka.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/15647742196.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/xonenarab.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/xigorusimi.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/32430046649.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/9shr5nh7oj3vt72uo81fj82o60/nowabederedoworozipa.pdfIn PDF document text
    • http://kkitv.com/images/upload/File/38731390693.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/73ghehj1qij7je5f0cl7860rd3/47650431735.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161025bd3b2a85---44585345158.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/48297437722.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/jotuvuvapexetadaruza.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/12070357931.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/eaps9oi25j9588d4uecra90i9d/fokuwujixigofarerokol.pdfIn PDF document text
    • http://lyshiying.com/d/files/vixumabudef.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/pumafigeloxu.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b82bd610a6e---35736277066.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/desunijuge.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_off0000cd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58D 18228 bytes
SHA-256: e706e8f77339445ca5437a8ae9fd214b4f4b47c5a77fe1de1fe69cd37b44c76f
font_02_sfnt_off000114c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C3 10448 bytes
SHA-256: 78a75cd2e58d8e158ed4591c94717578c7995952ae7b8400f0cac60126916579

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