Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f99ff7e549975b1…

MALICIOUS

PDF

95.6 KB Created: 2021-08-15 02:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 29b4f132a510ca56d76ff499d79e7f5c SHA-1: 792f2141d2bb35b2576ca12bc254f9fdb4df9c1e SHA-256: 3f99ff7e549975b18a859cd7a60eee0adb0fd52c55d37bda9ba1f881ba826312
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple PDF files hosted on compromised websites. The presence of numerous links on disposable hosting and the use of compromised CMS upload storage suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4cf61d789c---murogakujakilajola.pdf In PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/906e4da476634a1046d6c75dea566e14/puvepiwefurenexod.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/67520051282.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/rigekigadumufopexaji.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-24/20210524000006949886.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/igjdvnu4hh7q0lk4n81qircpp3/gebujegikeleniga.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/14747435084.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/61266879100.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094acbed34bc---korutifam.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/75460440086.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5620fd2990---76755472791.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886961a50b2---wiwutinorudax.pdfIn PDF document text
    • http://poliinc.com/upload/files/dipobege.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/jtfi3dj96q71b59mas1jl8jcqh/51593851737.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/89011790347.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/6924f554428df7afafb1ade5e368da41/serase.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/vejexijaramoxebezo.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/47774055661.pdfIn PDF document text
    • http://schokozentrale.de/idata/rojajo.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/80073477204.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948b1d5afb0---69735409999.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/gakuzop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+you+get+free+cat+food+in+battle+catsPDF 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_off00011257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A69 17068 bytes
SHA-256: 81c865f94bbc4d101b511a3d90ca5297738fdb86473ab6046c4364cd8385f9ad
font_02_sfnt_off000156bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156BD 11084 bytes
SHA-256: 977288445ff4cfefc46b036cdef2deb470a01db8a3645cd234f88cd8f431a4f2

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