Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccfd66ec436c2e46…

MALICIOUS

PDF

68.8 KB Created: 2021-10-03 04:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 25ad85343804c082e743d42a9407a090 SHA-1: 352ec9050690a561caadef07cb4d44d25c0ae70d SHA-256: ccfd66ec436c2e467c24dc8e3aef54abfdcb028e318575a5b092d4034919ba84
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains. The primary purpose appears to be directing users to external resources, potentially for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://bosingels.nl/ckfinder/userfiles/files/94849122545.pdf In PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ccb3fa082e---devowuwunabedujorok.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/15706795824.pdfIn PDF document text
    • http://logicamail.it/draft/media/vezolowapuxos.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/34041841503.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/91435416731.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161541b43d1e8d---kudimavuxakogogosoj.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/fapog.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/xewikizexinifipokufuleka.pdfIn PDF document text
    • http://senkyu.jp/webroot/img/files/sepefetufitezotuzoj.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/86242570409.pdfIn PDF document text
    • http://pk.mo/userfiles/file/87348828303.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a0812a9ad909219a89553f3505df0a62/58595486542.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149109e4f84c---pofofiru.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/927ec4eb983b7fa0e7b0e5e168c5587e/finotodevuni.pdfIn PDF document text
    • http://newcityhk.com/userfiles/48888836527.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/28312561422.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/47336395127.pdfIn PDF document text
    • http://ipllaser.in/uploads/84204782842.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/u2mfjr3a84t54t2ah2n0meje91/vapofigafefobupox.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/8951773666.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/59237060527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=radians+to+degrees+c%23PDF 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_off0000ad96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD96 10544 bytes
SHA-256: 26eedd632bdf9850723899ccb0f7bcd4295dc2822882d25039c4b60a0b3f79e5
font_01_sfnt_off0000c585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC585 15580 bytes
SHA-256: d2ede1923de37832df29697e3257c7541601e704c2c163c3ac93d399fa8d3b48
font_02_sfnt_off0000ed33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1