Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6dd8ce55ee9ac3…

MALICIOUS

PDF

93.2 KB Created: 2021-08-10 02:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 71d79e938a4b4ac8e47a2405a0f74257 SHA-1: 6a16c4acfca13dc53b3f22af483c3ce4a2857b48 SHA-256: 4c6dd8ce55ee9ac300d10faf7c9c2a1479590992710643086c5797f509784777
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the link farm and potential phishing/malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076496155f09---nugobelizinudosat.pdf In PDF document text
    • http://thueotodn.com/uploads/image/files/lagufide.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1472762d5e---98639448370.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/29q6lv6o61pv3o9p3mv0oanek1/doveduzugenotizagupawaz.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608845cc9adb5---xabazonujokira.pdfIn PDF document text
    • https://domilot.com/uploader/files/5012045221.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/95535828326.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/tovolufemoz.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/lunadifufoxikazodusog.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c1b3239a1---27643401224.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098459a0d0cc---pugowimikupe.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/rekutiwe.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/82166773135.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1434bcb0803d0d5adfa5666e395190b5/86522779130.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/zawiwosesapufakedav.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/907396344.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/c134f9a3f026f64eebe47f6ad727401f/vajapiw.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/ruses.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/9e52894d2990ebfdd9e57d9fa0a58b16/notenotugoruvum.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073140ace164---56509938295.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/bidanej.pdfIn PDF document text
    • http://www.toptehnik.si/images/pegefuwowelijipegodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=roblox+character+id+codesPDF 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_off0000ffa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA6 20312 bytes
SHA-256: 6f64f2c69f561870ea216733819d185938859475fc35570cf42d4a70efa226bc
font_01_sfnt_off0001356d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D84 10652 bytes
SHA-256: 7625fefe574693b6eaf1c67923fb51d835eda6f65cdbb1b3892fe652d1510f70