Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ffe56919e58a87…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 03:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b8c6b249081ad5b5d6c6d8d9c5f258ad SHA-1: 35a6b913677dddec0d692aa891af7ca75192c1df SHA-256: d3ffe56919e58a870b4231fc89747482ad7bc3bbbdf9cbb2d6a7ce196851853b
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm and a browser installation lure. The embedded URLs, particularly those hosted on compromised CMS uploads, suggest an attempt to redirect users to malicious sites. The presence of PDF-specific heuristics and the nature of the lure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139efa4cc17f---puvuka.pdf In PDF document text
    • https://armagedonspedycja.pl/files/file/muxovibevu.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/23090578665.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/46677516014.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/tuwubam.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/lizukutadut.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/49d1f1d029e3d6618f56dc7614ab7131/forox.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/mupufemoromu.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/koxorufajinuzisorigep.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/wofobu.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/23637105668.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/reprsnqndis8ubhq7sn1cp8bns/wemogejibiveluziduvonivip.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/56985230464.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/masawekasugenitiza.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/ruxukedebe.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/96386265923.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/zokitigejutanod.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161407a485873b---80568415607.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/43939825571.pdfIn PDF document text
    • https://cityface.cz/res/file/59836438110.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f55915bce---16096274748.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/vomubilaxilekat.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/weduzusunimokalirivoruzaw.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/xizujujonevevanef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=downloader+apk+sd+cardPDF 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_off0000d89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89B 10496 bytes
SHA-256: cbbccadc42d967e1dfee571a74cbcff80c83549e5e9373ccdc5e61cbbbaaf6ad
font_01_sfnt_off0000f0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A5 17276 bytes
SHA-256: c1db9b0e24580e3338b702b05193a790623d4528efe6e6e9b0a9045b89b41eca
font_02_sfnt_off00011d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.