Malicious PDF — malware analysis report

Static analysis result for SHA-256 1808e3d6c46fdc11…

MALICIOUS

PDF

72.9 KB Created: 2021-09-17 08:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8b0ea9a7b7ee10b3b928661939bcc205 SHA-1: edfce6b6806b508b852c9db1711bb79e5e39e49a SHA-256: 1808e3d6c46fdc11668e1e29ff9c3043edd81db906ee67d7d9c74b498a7d6c2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, likely intended to lure users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nguoigiupviec99.com/webroot/img/files/retekukobefosemeja.pdf In PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/66919584602.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/ridafezeruseladoxepugisem.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///63788258800.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210916233803.pdfIn PDF document text
    • http://hocomesun.com/upload/98993151315.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/95225873055.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143b65ab77f9---79895493271.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/30644941415.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/zuker.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161357b21cd5d5---54585374315.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/xomazixega.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131dc1fc4183---80838039155.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/87447936241.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210917_BC80A8FF50F61B10.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210913230720.pdfIn PDF document text
    • http://maulich.vn/attachment/files/15914673644.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161319fabe546a---joparojevedosuf.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/talotezopijojizalir.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/zivafividefujobidiwib.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/9502550398.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/92588306542.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/82254543104.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/27129295123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=minecraft+play+now+no+downloadPDF 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_off0000bcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF8 10636 bytes
SHA-256: 947a13f5a65e89246c9bcb216df4abe9e1e9124f971d761c8dd0a7cf87812c93
font_01_sfnt_off0000d57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8E 15864 bytes
SHA-256: f60d9315f37b0b0458a733b0a6333e35a5f318afdd0ea4755d0f33151193059c

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